The dog is a domesticated form of the wolf, a member of the Canidae family of the order Carnivora. The term is used for both feral and pet varieties. The domestic dog has been one of the most widely kept working and companion animals in human history.

Dogs have been selectively bred for thousands of years, sometimes by inbreeding dogs from the same ancestral lines, sometimes by mixing dogs from very different lines.The process continues today, resulting in a wide variety of breeds, hybrids and types of dogs. Dogs are the only animal with such a wide variation in appearance without speciation, "from the Chihuahua to the Great Dane".

The cat , also known as the domestic cat or housecat to distinguish it from other felines and felids, is a small domesticated carnivorous mammal that is valued by humans for its companionship and its ability to hunt vermin and household pests. Cats have been associated with humans for at least 9,500 years, and are currently the most popular pet in the world.Due to their close association with humans, cats are now found almost everywhere on Earth. This extreme adaptability and their worrying impacts on native animals has led to them being classed as an invasive species. Most of these problems are caused by the large number of feral cats worldwide, with a population of up to 60 million of these animals in the United States alone.

Cats & Dogs is a 2001 American family film directed by Lawrence Guterman. The screenplay by John Requa and Glenn Ficarra centers on the relationships between cats and dogs. It was shot in Victoria and Vancouver.

Polyneuropathy in dogs and cats is a collection of peripheral nerve disorders that often are breed-related in these animals. Polyneuropathy indicates that multiple nerves are involved, unlike mononeuropathy. Polyneuropathy usually involves motor nerve dysfunction, also known as lower motor neuron disease. Symptoms include decreased or absent reflexes and muscle tone, weakness, or paralysis. It often occurs in the rear legs and is bilateral. Most are chronic problems with a slow onset of symptoms, but some occur suddenly.

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