Science Fair Project Encyclopedia
Less common are larger mammals such as dogs and cats. In part, these animals have become less common because pet stores have received considerable bad press for their inappropriate care of puppies and kittens, which need socialization and which are more vulnerable to illnesses, and for their use of animals from puppy mills. As a result, it is usually easier to find puppies and kittens from animal shelters, private breeders, or rescue groups .
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