Parasites cause significant welfare harm in cats. Preventive parasite control protects against fleas, ticks, roundworms, tapeworms, and other parasites that cause discomfort, disease, and death.
Parasite burden causes chronic welfare harm that owners frequently fail to recognize because cats adapt to parasitism rather than showing obvious signs. Heavy flea infestations cause constant itching, dermatitis, anemia, and transmission of tapeworms. Roundworm and hookworm burdens cause nutritional drain, especially in kittens who can become critically ill from heavy infections. Comprehensive parasite prevention tailored to the individual cat's risk factors — indoor versus outdoor, geographic location, prey exposure — eliminates preventable sources of chronic discomfort. The welfare benefit of parasite prevention is felt by the cat as reduced itching, better coat condition, improved appetite, and greater energy and engagement.