This document discusses various parasites that can infect pets and humans, including fleas, ticks, roundworms, coccidia, whipworms, hookworms, tapeworms, and Giardia. It notes that roundworms can lay thousands of eggs daily and cause organ damage in pets. Several parasites like whipworms and hookworms can cause bloody diarrhea and weight loss. The document emphasizes the importance of parasite prevention and compliance with treatment, as parasites can be passed between pets and humans. It provides tips for veterinary staff to promote compliance and discusses the prevalence of Giardia in dogs and cats based on a survey.