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Owners who want to better understand their canine companions must recognize that dogs see the world from a different visual perspective. The differences begin with the structure of the eye. We have a good idea what dogs see because we know the make-up of the retina of a dog’s eye.

The retina is the light sensitive portion of the eye. This structure is located in the back of the inside of the eyeball. The retina contains two types of light sensitive cells: rods and cones. Cones provide color perception and detailed sight, while rods detect motion and vision in dim light. Dogs have rod-dominated retinas that allow them to see well in the dark. Along with superior night vision, dogs have better motion visibility than humans have. However, because their retinas’ contain only about one-tenth the concentration of cones that humans have, dogs do not see colors as humans do.

Dogs see like a color-blind human. Many people think that a person who is red/green color blind cannot see any color, but there are variations of color blindness. Most people have vision that is trichromatic (three-color variations). People who are red/green color blind are dichromatic (two color variations). Dogs’ retinas can distinguish two colors. These colors are blue-violet and yellow. Dogs can also differentiate between shades of gray. Dogs are unable to recognize green, yellow, orange, and red.

Dogs use other cues such as smell, texture, brightness, and position rather than relying solely on color. Seeing-eye dogs, for example, may not distinguish between a green or red stoplight; they look at the brightness and position of the light. This, along with the flow and noise of traffic, tell the dog that it is the right time to cross the street.

How a dog’s eyes are set determines the field of view as well as depth perception. Prey species tend to have eyes located on the sides of their head. This gives the animals an increased field of view and allows them to see approaching predators. Predator species, like humans and dogs, have eyes set close together. Human eyes are set straight forward while dog eyes, depending on the breed, are usually set at a 20 degree angle. This angle increases the field of view and therefore increases the peripheral vision of the dog.

Increased peripheral vision compromises the amount of binocular vision. Binocular vision occurs where the field of view of each eye overlaps. Binocular vision is necessary for depth perception. The wider-set eyes of dogs have less overlap and less binocular vision, thus, less depth perception). Dogs’ depth perception is best when they look straight ahead. This is not an ideal situation, as their nose often interferes. Predators need binocular vision as a survival tool. Binocular vision aids in jumping, leaping, catching, and many other activities fundamental to predators.

In addition to having less binocular vision than humans have, dogs also have less visual acuity. Humans with perfect eyesight are said to have 20/20 vision. This means that we can distinguish letters or objects at a distance of 20 feet. Dogs typically have 20/75 vision. What this means is that they must be 20 feet from an object to see it as well as a human standing 75 feet away. Certain breeds have better visual acuity. Labradors, commonly used as seeing-eye dogs, are bred for better eyesight and may have vision that is closer to 20/20.

If you’re silently standing across the field from your dog, don’t expect him or her to recognize you. He’ll recognize you when you do some sort of motion particular to yourself. He may also recognize your presence by his outstanding sense of smell and/or hearing. Because of the large number of rods in the retina, dogs see moving objects much better than they see stationary objects. Motion sensitivity has been noted as the critical aspect of canine vision. Much of dog behavior deals with posture and appropriateness. Small changes in your body posture mean a lot to your dog. Dog owners need to modify training based on this fact. If you want your dog to perform an action based on a silent cue, we suggest using a wide sweeping hand and arm motion in order to cue your dog.

When dogs go blind, owners often wonder if the dogs’ quality of life has diminished to the point where they are no longer happy. Humans deal well with being blind, and humans are much more dependent on their eyes than are dogs. Blind dogs lead happy lives as long as they are comfortable. The owner may need to make some adjustments in the pet’s environment. Some of these adjustments include fencing the yard, taking leashed walks, and not leaving unusual objects in the dog’s normal pathways. Obviously, most blind dogs cannot navigate stairs very well. When blind dogs are in their normal environment, most people don’t know they are blind.

When a dog dies, owners will often notice some changes in the pets that are left behind. They may become aloof or lethargic. Some may stop eating or become clingy. Based on these outward signs, it appears that dogs grieve when their canine companion dies.

Because our pets cannot speak, we don't really know what is going through their minds. We must base our interpretations of their emotional state on their behavior—what they do in certain situations and under specific circumstances.

When a person experiences the death of a human loved one, we may know how he feels grief based on what he says. Very often, however, it is how he reacts or what he does that tells us he is suffering. He loses focus, becomes listless and disoriented, doesn't eat and becomes disinterested in what is happening around him. The person may cry, go without sleep or sleep more than usual.

An animal that is experiencing the loss of another animal companion may react similarly. Some animals can actually become depressed when they lose a loved one. They show symptoms similar to humans, such as loss of interest in their favorite activities and sleeping more than usual. However, dogs may sometimes distance themselves from the family and sleep more than usual when they are ill, so you should consult with your veterinarian before seeing a behaviorist if your dog exhibits such symptoms.

Your dog may lose her appetite, become disoriented or become more clingy. If the deceased dog was taken to a veterinarian to be euthanized, the grieving dog may sit at the window for days, watching for her return. Animal behaviorists commonly call this emotional state "separation anxiety". On the surface, the pet's behavior is similar to that of a person experiencing grief over the loss of a loved one.

The American Society for the Prevention of Cruelty to Animals conducted a "Companion Animal Mourning Project" in 1996. The study found that 36 percent of dogs ate less than usual after the death of another canine companion, while about 11 percent stopped eating completely. About 63 percent of dogs vocalized more than normal or became quieter. Study respondents also indicated that surviving dogs changed the quantity and location of sleep. More than half the surviving pets became more affectionate and clingy with their caregivers. Overall, the study revealed that 66 percent of dogs exhibited four or more behavioral changes after losing a pet companion.

If your dog shows signs that she is grieving the loss of an animal or human family member, provide her with more attention and affection. Take her mind off the loss by engaging in a favorite activity. If she enjoys human company, invite friends she likes over to spend time with her. Use environmental enrichment techniques like toys to help keep her busy. Hide toys or treats at her favorite spots for her to find during the day.

If your dog is very depressed over the loss, she may not respond to extra activity right away. The old saying "time heals all wounds" has meaning for your dog, too. Time is one thing that may help. Based on the results of the ASPCA study, most dogs returned to normal after about two weeks, but some dogs took up to six months to fully recover.

If your dog is vocalizing more or howling, don't give her treats to distract her This might unintentionally reinforce the howling. Giving attention during any behavior will reinforce it, so be sure you are not reinforcing a behavior you don't like. Give attention at a time when your dog is engaging in behaviors that you do like, such as when she is resting quietly or watching the squirrels. As the pain of the loss begins to subside, so should the vocalizing, if it is related to the grieving process.

You may also want to consult with your veterinarian about drug therapy to help decrease your dog's anxiety.

If you are thinking about adding another dog to your home, wait until you and your surviving dog have adjusted to the loss. Forcing your dog to get to know a newcomer will only add stress to her already anxiety-ridden emotional state. And be patient. Your dog may miss her canine companion as much as you do.

Scientists believe that the predecessor to the first land carnivores was most likely an animal called Miacis. Miacis lived about 55 million years ago and fossils show that the animal looked somewhat like a weasel.

The cat family split from other mammals about 40 million years ago, making them one of the oldest mammalian families. The best-known cats of pre-history were probably the saber-toothed cats (Smilodon) that lived during the late Pleistocene era (1.8 million to 10,000 years ago). Saber-toothed tigers, forerunners of the modern cat, were named for their sharp dagger-like canines. Able to kill full-grown elephants, these animals were plentiful in Europe, Asia, Africa and North America. Their small brain, large body and cumbersome teeth led to their extinction about 10,000 years ago.

Although the saber-toothed cat has no close living relatives, paleontologists reconstruct how Smilodon looked by comparing its bones with those of large cats living today. Often called a saber-tooth tiger, Smilodon was not actually related to the tiger, although it may have behaved a bit like one. Scientists have determined that the saber tooth's skeleton was not built for speed. Very powerful front legs and a short tail indicate that it probably ambushed its prey, goring it with those fearsome canine teeth and leaving the victim to bleed to death.

Wild cats are believed to have evolved in Africa, and due to continental drift, eventually arrived in South America. About 2 million years ago, when North America and South America joined together, the cat made it's migration northward.

Evolutionary biologists agree that the domestic cat is a cross between Felis sylvestris (European wildcat) and Felis lybica (African wildcat). Of all the cats in existence, the domestic cat is the only one that has agreed to live with humans. Due to this fact, the domestic cat has been given the name "Felis domestica."

Cats were first domesticated by the Egyptians around 3000 BC in order to control the rodent problem in their cities. Since the Egyptians stored grain in woven reed baskets, rodents were able to chew through these baskets and eat the grain. With no devices, poisons or traps to fight the increasing rodent population, rats and mice swarmed through the cities. During this period, a small yellow cat with black stripes (the predecessor of today's domestic cat) began coming into the cities in order to feast on the rodents. The Egyptians welcomed these visitors and encouraged them to stay. The Egyptians named their new domestic animal "mau."

After realizing that cats had helped them solve their rodent problem, the Egyptians began holding them in high regard. Not only did the cat gradually take up residence in Egyptian households, but came to be revered and worshiped as being godlike. Bast, the Egyptian goddess of fecundity and beauty was depicted with the head of a cat. This beautiful goddess was the symbol of light, heat and solar energy. It was believed that she controlled fertility, cured illnesses and took care of the dead souls. According to Egyptian history, cats were held in such high regard that their export was forbidden, and the penalty for killing a cat was immediate death.

Cats were mummified after death and buried in sanctified plots, often with supplies of mummified mice for the afterlife. In 1890, one such plot was found to contain the remains of 300,000 cat mummies. The mummies were wrapped in expensive colorful cloth and enclosed in engraved wooden cases. Many of these mummies were distributed to museums around the world.

Since they reproduced prolifically and lived long and healthy lives, the Egyptian cat population began to swell. For a long time, Egypt had held a strict rule that cats could not leave the country. Despite this rule, the Egyptians began selling cats to the Greeks. After several years of breeding, the Greeks started selling cats to the Romans, the Gaels, the Celts and later to the Europeans. Resulting from trade relationships between Asia and Europe, cats were being exchanged for silk. The Asians loved their cats and began breeding them right away. Several distinct breeds of cats were produced in Asia, such as the Siamese, the Balinese, and the Himalayan.

Previous to the introduction of the domestic cat, the only mouse hunters in ancient Europe were semi-domesticated weasels and skunks. The Romans, and to a certain extent, the Greeks, introduced the domestic cat to the rest of Europe. In European countries, the cat was not worshipped but kept as a companion as well as a rodent hunter. However, by the time the Black Death appeared in the 11th century, cats were once again held in high esteem for their rodent killing abilities.

The Middle Ages in Europe were the worst times for cats. Cats were believed to be agents of the devil, and thought to possess magical powers. Pope Gregory IX declared the cat to be a "diabolical creature" and authorized a total persecution. Persons who kept cats were suspected of being witches, and were put to death along with their feline companions. With rat extermination becoming urgently necessary, cats were beaten, killed and driven away from towns and villages.

In Tudor England, cats were burned as a sign of both Protestant and Catholic heresy. During the inquisition, the burning of heretics, Jews, witches and cats were just some of the atrocities that were committed. By the 15th century, the European cat was on the verge of extinction, thus allowing the population of rats to increase. For lack of cats, more than two thirds of Europe died from the Bubonic plague.

Eventually the witch-hunts ceased and cats once again became highly prized and beloved household pets.

Cats were first domesticated over 5000 years ago and have since become one of the most popular pets in the world. The first record of domestic cats in Great Britain dates back to 936 AD. By the mid 18th century, cats were fairly abundant in the United States. By the late 1800s distinctive breeds were being established and cat shows held, with the long-haired breeds being especially popular.

Although the North American continent had many varieties of wild cats, there had been no history of domestic cats preceding the arrival of the Europeans. The first domestic cats were imported in order to control the rodent population in the settlements. Eventually, cats became quite popular and the first American breed, the Maine Coon Cat, was established.

Domestic cats now live on every continent except Antarctica and have been bred into more than fifty distinct breeds.

You can learn a lot about the health of your pet from his or her urine. This smelly yellow liquid provides a variety of clues that can help your veterinarian solve the mystery of your pet's health.

Like people, pets should have yellow urine that has a characteristic odor. Most pets develop a pattern and urinate with the same frequency each day.

Changes in frequency of urination, blood in the urine and pain during urination are common signs of infection and/or irritation. Most pet owners are very good at noticing these signs.

Your pet's urine can be collected at home or in the veterinary hospital. The 'free catch' method for collecting urine can be done at home. When walking your dog, slip a plastic bowl or container under his leg when he stops to urinate. To speed up the process, you can feed your dog several ice cubes before leaving for the walk. Free catch does not require intensive labor, money, or time, nor does it upset your pet. There are some disadvantages to the free catch method. The free catch method does not provide sterile urine and may be contaminated by bacteria from the environment. If the urine is not transported immediately to the hospital, some of the tests may yield inaccurate results.

Your veterinarian or a veterinary technician can obtain a fresh urine sample from your pet by catheterizing the bladder. This collection procedure requires the animal's cooperation and often requires sedation.

Once the urine is obtained, the first thing examined is the sediment. Sediment refers to the cells floating in the urine. An increased number of white blood cells signals inflammation and helps with the diagnosis of a bladder infection. With bladder infections, large numbers of bacteria may also be present.

Due to the long length of the urethra, female dogs are more prone to urinary tract infections than male dogs. Diabetic animals have an increased amount of glucose in the urine, which may promote bacterial growth and cause infection.

Animals can form bladder stones due to a genetic condition, if urine flow is decreased or if the bladder wall is irritated. Stones can sometimes be seen on x-rays and they can often be located during ultrasound examination. Surgery is usually required to remove large bladder stones.

Examination of the urine is also important for diagnosing kidney disease. The specific gravity (of the urine) compares the weight of urine to the weight of water, detecting functional problems with the kidneys. The specific gravity indicates how well the animal is concentrating its urine. If the specific gravity is low (approaching that of water), the kidneys may not be eliminating the body's waste products properly into the urine. Instead of eliminating the waste products into the urine, they accumulate in the blood stream and cause problems.

Various minerals can solidify in urine to form casts and crystals. The presence of calcium oxalate crystals, for example, can be found as a result of ethylene glycol (antifreeze) toxicity. Ammonium biurate crystals are red flags for liver disease. The most commonly found crystals are triple phosphate (magnesium ammonium phosphate) and can signify a bladder infection.

The kidney is composed of a series of tubules that aid in making urine. Substances are either absorbed back into the body or excreted in the tubules as urine. If casts are found in the urine, this may indicate a problem with the tubules in the kidney. Casts are solid clumps of protein cells or red and white blood cells. These cells collect in the tubules and are shed sporadically. These casts have a tube-like shape and can be seen under a microscope.

Urine is so much more than a waste product. Your pet's urine test means a lot for his or her health. It provides many interesting diagnostic clues that help determine what's going on inside your pet!

Pet owners vary in their level of comfort in clipping the nails of their dog, cat, rabbit or bird. But it is necessary to regularly clip nails to help maintain health and comfort. Nails which are uncared for can break or tear and can affect the animal's ability to move about comfortably or cause the animal to injure itself when scratching. If you are uncomfortable clipping the animal's nails yourself, your vet or groomer can do this for you. If you decide to do it yourself, here are a few tips:

1. Remember, the nail is living tissue. Do not clip too close to the quick. If this occurs, the animal will experience pain and the nail will bleed.



Clipping Nail Below the Quick (The quick is the pink area.)



2. There are two types of nail clippers available: the scissor type (which resembles a traditional scissors) or the guillotine type (which surrounds the whole nail). Both are effective. Choose the one that is most comfortable for you and your pet.
3. Many animals resist nail clipping. One way to get them accustomed to it is to handle their paws or feet from a very early age.

Dog owners in New York may be worried for the safety of their pets following the discovery of a rabid raccoon in Brooklyn’s Boerum Hill neighborhood on February 12. If you’re a resident of the area, keep reading to learn more about the situation and to find out what you can do to protect yourself and your companions.

While raccoons infected with the rabies disease have been common in other areas of New York in recent years, Dr. Sally Slavinski, assistant director of the New York City Department of Health’s Zoonotic, Influenza and Vector Borne Disease Unit, told New York’s Courier Life Publications that the finding in Brooklyn marks the borough’s first sighting in raccoons. While the agency does not yet know the extent of the infection in raccoons in Brooklyn, they are planning to enhance their surveillance of raccoons in the borough. “Right now, it’s an isolated incident,” she told the paper.

While other areas of New York City have seen more cases, it does not appear that raccoons that carry the rabies virus are all that common. According to CNN, health officials received 10 reports of rabid raccoons in Manhattan in 2009, eight of which were in December. In the five years from 2003 to 2008, only one confirmed case has been recorded. The last human case of the virus in New York City occurred in 1953.

New York City is taking control of the situation, according to WABC-TV. Starting in February 2010, wildlife experts began “humanely trapping” raccoons in various parks in the city. “The animals will be vaccinated, marked for identification, and released,” the television station reported. The process will be repeated in summer to vaccinate any raccoons born in the spring.

Raccoons are nocturnal animals, and the University of Texas at Austin’s Environmental Health and Safety department says that “although nocturnal animals are most active throughout the night, it is not an indication that something is necessarily wrong if seen out during the day.” However, the University says that it will be “fairly obvious” if a nocturnal animal is sick. Symptoms can vary but include slow or tame movements, excessive saliva or an apparent “foaming” at the mouth, and an attempt to bite at anything. Should you see an animal that appears to be sick, stay away and call your local animal control center or 311.

Prevention is the best method for ensuring your animal does not acquire the virus. New York State requires all domestic dogs, cats and ferrets to be vaccinated against rabies no later than four months after the pet’s date of birth, and in New York City, the deadline for vaccination is three months after the date of birth. When outside, keep your dog on a leash as often as possible. Please follow these guidelines to prevent your pet from being infected and also to stop the spread of the disease.