The Patient

Animals can be conveniently divided into two broad categories: food-producing animals and companion animals. Food-producing animals include cattle, sheep, swine, and poultry, together with fish and any other animal from which meat or other products such as eggs or milk are obtained. Companion animals are those that are considered pets and include dogs, cats, and horses. Birds, lizards, rabbits, etc. can be considered companion animals; however, they are sometimes classified as "exotic" animals. Because the latter species represent only a small proportion of the companion animal market, dosage forms that have been developed for the more common species (e.g., dogs and cats), or indeed, for humans, are often adapted for use in the exotic species since the markets are not usually large enough to warrant development of such specialized products.

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