Newsletter

With warmer weather approaching, plenty of pet owners are thinking of getting into shape before hitting the beach. But what about pets? Obesity is a growing problem among both cats and dogs. And much like humans, too many extra pounds can have far-reaching consequences for our animal companions. In this report from the Veterinary News Network, Dr. Jim Humphries discusses the health problems that can occur if your pet is overweight and shares tips on how you can get your pet's weight under control.

Winter is a difficult time for pets. Outdoor animals need extra care in order to cope with the cold weather. Special attention should also be paid to older animals, young puppies, and animals with short coats.

It is important for all animals to be properly nourished during the winter months. Outdoor animals require about 25 percent more food during the winter months than during warmer months. The increase in food is necessary to generate enough heat for the body to stay warm. Indoor animals often require less food, since exercise is generally limited.

Pets require adequate shelter during the cold weather. Outdoor dogs should have an insulated dog house that is protected from the wind. The dog house should not be too large (the heat that the dog generates is used to keep him or her warm) and the opening should face south or southeast. A plastic flap should cover the entrance, especially during windy days. Straw, hay, or blankets make excellent bedding material.

Cats generally do not find dog houses very appealing. A small entrance flap (cat door) to the basement of the house, or to the garage, will provide an access to shelter during the cold weather.

Outdoor animals cannot eat snow for a source of water. Clean, fresh water must be provided several times each day. A water heater is a practical solution; however, it must be safe and installed properly.

During the cold weather, cats often take shelter under the hood of cars. A warm engine is a comfortable area for a cat to rest. When the car is started, the cat risks severe injuries from the fan belt or blades. Before starting a car, knock on the hood or raise it in order to conduct a safety check.

Paws should be checked regularly during the winter months. Snow and ice should be removed from the fur located between the toes. Damp paws should be thoroughly dried. Moisture that accumulates between the toes can cause sores. De-icing chemicals and salt are common irritants. If these products are commonly used, animals paws should be bathed regularly.

Antifreeze is extremely toxic if ingested by animals. The sweet taste is often appealing to cats and dogs. Antifreeze that is spilled should be cleaned up immediately.

Pets often experience dry skin during the winter months. Lack of humidity tends to dry the skin. Frequent grooming and brushing helps stimulate the production of oil from the skin glands. A topical humectant spray can be purchased at the hospital to help moisturize the skin and keep the coat shiny.

Occasionally an animal is accidentally left outdoors for an extended period of time in extremely cold weather. As a result, frostbite may occur. The most common areas for frostbite are the tips of the ears, paw pads, and the tip of the tail. The frostbite area should be bathed in warm, not hot, water, and the animal then should be taken to a veterinary hospital.

Kindness is the best care for animals during the winter months. If the temperature drops below 15 degrees F., the pet should be moved indoors. If an animal is shivering or refuses to play, this generally means that he or she is too cold and should be brought indoors.

One aspect of cats' behavior which some owners find difficult to accept is hunting, especially when the cat insist on bringing her prey home. Hunting is a very strong instinct in cats and the techniques can be while watching young kittens at play. As the kittens grow older, the skills are finely honed through further play and by watching the mother and mimicking her when she hunts.

Hunting is entirely natural for cats and takes place even when they are well fed at home. They evidently enjoy the hunt, stalking patiently and carefully, moving forward and freezing with single minded concentration until they are close enough to pounce. If the cat returns with her kill and presents it to her owner, the reason is possibly because you should congratulate her on her hunting prowess. There is really no point in trying to punish your cat for hunting as it is a part of her nature that is so deeply rooted that to try and eliminate it may well cause her a lot of confusion. Playing catching games with your cat using toys may help to relieve some of her urge to hunt.

One solution is to put a bell on her collar so that the birds and other likely victims can hear her coming. If you do this, make sure that the collar has an elasticated section so that she can escape if it gets caught up on some object. It is important to worm your cat regularly, particularly if she hunts. Consult your veterinary hospital for more advice on de-worming.

Lumps are a very common occurrence, especially in aging pets. Approximately 30 percent of all tumors found in dogs and cats occur on the skin. There are a couple of important questions owners should ask themselves when they find lumps on their pets.

• Has the lump appeared suddenly, or has it been there awhile?
• Has the lump stayed the same in consistency and appearance or has it changed recently?
• Does the lump seem to separate from underlying tissue or is it attached?
• Is there only one lump or are there multiple similar lumps?
• And finally, are there changes in your pet's behavior such as eating less, losing weight, vomiting, diarrhea, or lethargy?

Answering these questions may help your veterinarian evaluate the seriousness of the lump's presence.

Often, lumps are benign accumulations of fat known as lipomas. Keep in mind, however, that while all lipomas are lumps, not all lumps are lipomas. Any detected lump should be evaluated for the possibility of a more aggressive malignancy. In general, many benign lumps may grow slowly or not at all and remain unchanged for many months or even years. Most malignant lumps, however, grow rapidly and may infiltrate into the underlying tissue. The best way to figure out if a lump is benign or malignant is to have your pet examined by a veterinarian.

Many skin tumors, benign or malignant, can be cured with surgery. Unfortunately, skin tumors could be just the tip of the iceberg. Diagnostic tests may be needed to determine if the lump on your pet might be a manifestation of a more widespread disease.

Canine Mast Cell Tumor

The most common malignant skin cancer in dogs is the mast cell tumor. Mast cells are normal cells in the body that serve as a defense mechanism. When you are bitten by a mosquito, for instance, the mast cells initiate the inflammatory response that causes the production of a red and itchy hive. Mast cells also contribute to asthma and food allergies.

If the normal mast cell undergoes a malignant change, a mast cell tumor may be produced. Canine mast cell tumors may be benign or possess varying degrees of malignancy. Malignancies range from local reoccurrence following surgical removal to aggressive systemic disease, which may ultimately be fatal. Biopsy can help determine the aggressiveness of a mast call tumor.

Although mast cell tumors primarily affect the skin, they have the potential to spread to other areas of the body. Therefore, it is important not only to address the skin tumor, but also to fully evaluate the pet for signs of metastasis. This often includes blood work, thoracic radiographs and abdominal ultrasound. If there is no evidence of tumor metastasis, surgical removal of the mast cell tumor may cure the problem. If complete surgical removal is not possible, radiation therapy or chemotherapy can be considered.

Feline cutaneous (skin) mast cell tumors are generally benign and surgical removal is often curative. Metastasis from a skin mast call tumor is not as common in cats as it is in dogs. Some cats, however, may produce a distinctly different type of mast cell tumor that primarily affects internal organs, such as the spleen, liver and bone marrow. This type of mast cell tumor is called visceral mastocytosis and is much more aggressive than mast cell tumors of the skin.

When you notice a lump or bump on your pet, it is best to have your pet examined by a veterinarian as soon as possible. Many pets have lumps that remain benign all of their lives, but if a lump is malignant, your pet has a better prognosis if treated early. Skin cancers are quite common and often can be cured. The best way to detect lumps at any stage is to give your pet full body rubs on a regular basis. Not only are you contributing to your pet's health and your own peace of mind, your pet is going to love the attention!

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.

Colors That Humans See

Colors That Dogs See

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.