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Life cycle: Ingestion of oocysts, which release sporozoites that enter intestinal cells. Impact: Coccidiosis, diarrheal disease mostly in young animals. Treatment: Sulfadimethoxine or trimethoprim-sulfonamides.

Life cycle: Not a parasite itself, but an allergic reaction to flea bites. Impact: Intense itching and over-grooming, leading to skin lesions. Treatment: Strict flea control, anti-inflammatory medications, and possibly desensitization.

Life cycle: Spread via mosquito bite, matures into adult worms in the heart/lungs. Impact: Heartworm disease can cause severe heart and lung damage. Treatment: Adulticide therapy with melarsomine, preventatives like ivermectin.

Life cycle: Transmitted by ticks; protozoa infect red blood cells. Impact: Babesiosis, causing hemolytic anemia, fever, and weakness. Treatment: Imidocarb dipropionate, supportive care.

Life cycle: Eggs passed in feces develop into larvae, larvae penetrate skin or ingested. Impact: Hookworms cause anemia and protein loss. Treatment: Pyrantel pamoate, benzimidazoles or ivermectin.

Life cycle: Eggs shed in feces develop into infectious stage in soil, ingested by next host. Impact: Can cause trichuriasis, typically mild but can be severe in heavy infections. Treatment: Febantel, fenbendazole, or milbemycin oxime.

Life cycle: Direct transmission through fecal-oral route amongst cats. Impact: Causes chronic diarrhea and colitis, especially in densely housed populations like catteries. Treatment: Ronidazole is the only effective treatment.

Life cycle: Direct transmission between animals or via the environment; lifecycle is completed on the host. Impact: Causes ‘walking dandruff’, skin scaling, and pruritus. Treatment: Selamectin, ivermectin or fipronil.

Life cycle: Snails release cercariae, which penetrate mammalian skin. Impact: Causes schistosomiasis, presenting with diarrhea and liver disease. Treatment: Praziquantel.

Life cycle: Transferred directly from mother to puppy during first few days of life. Lives and reproduces in hair follicles. Impact: Can cause demodectic mange leading to hair loss, skin infections. Treatment: Amitraz dips, ivermectin or fluralaner.

Life cycle: Mites are transmitted directly from host to host. Impact: Causes ear mites, leading to otitis externa, scratching, and secondary infections. Treatment: Topical miticides like ivermectin or selamectin.

Life cycle: Transmitted primarily through arthropod vectors or direct contact with infected blood. Impact: Causes feline infectious anemia, fever, lethargy, and jaundice. Treatment: Antibiotics like doxycycline, and supportive care.

Life cycle: Dogs ingest intermediate host tissues containing hydatid cysts, adult worms in intestine release eggs that are shed in feces. Impact: Hydatid disease in livestock and humans - cysts in organs. Treatment: Praziquantel for dogs, surgical removal of cysts in humans.

Life cycle: Dogs and cats become infected by ingesting intermediate hosts (rabbits) harboring cysticerci. Impact: Usually asymptomatic, may cause mild GI upset. Treatment: Praziquantel or epsiprantel.

Life cycle: Follows the typical tick three-host life cycle; dogs are the favored host for all life stages. Impact: Can transmit diseases like ehrlichiosis and babesiosis. Treatment: Acaricides and tick control measures.

Life cycle: Transmitted by sand flies; infects white blood cells and macrophages. Impact: Leishmaniasis, leading to skin lesions, weight loss, organ damage. Treatment: Antimonials, allopurinol, and supportive care.

Life cycle: Ingested as a cyst, transforms to trophozoites in intestine and then re-encysts to be excreted. Impact: Causes giardiasis, diarrhea. Treatment: Metronidazole or fenbendazole.

Life cycle: Transmitted via ingestion of eggs, transplacental or transmammary. Larvae migrate through host's organs. Impact: Causes visceral larva migrans, particularly dangerous for young children. Treatment: Anthelmintics such as pyrantel pamoate or fenbendazole.

Life cycle: Cats shed oocysts in feces; intermediate hosts ingest oocysts, which then form tissue cysts. Impact: Usually asymptomatic in cats, can cause toxoplasmosis in humans. Treatment: Clindamycin for acute infection in cats; often self-limiting in healthy humans.

Life cycle: Transmitted via direct contact with infested animal. Lives on skin surface. Impact: Causes sarcoptic mange with intense scratching, skin irritation. Treatment: Ivermectin, selamectin or oral fluralaner.

Life cycle: Four-stage life cycle (egg, larva, nymph, adult); requires a blood meal to progress to each stage. Impact: Can transmit Lyme disease, anaplasmosis, babesiosis. Treatment: Prevention with tick control products; antibiotics for Lyme disease.

Life cycle: Completes its life cycle in the environment; humans and mammals serve as hosts for adult fleas. Impact: Causes flea bites dermatitis and can transmit the plague and tapeworms. Treatment: Environmental control, insect growth regulators, and adulticides.

Life cycle: Transmitted through saliva after a bite from infected animal, virus travels to CNS. Impact: Fatal once symptoms appear, causes neurological issues. Treatment: Post-exposure prophylaxis for humans and animals; vaccination for prevention.

Life cycle: Lifecycle involves fleas as intermediary hosts. Dogs become infected by ingesting fleas carrying larval tapeworms. Impact: Usually mild but may cause itching and discomfort. Treatment: Praziquantel is effective.

Life cycle: Transmitted primarily through bite wounds, infects and replicates in white blood cells. Impact: Weakens immune system, increasing vulnerability to other infections. Treatment: Supportive care, no specific antiviral treatment for FIV.

Life cycle: Goes from eggs to larvae to pupae and then adult fleas on the host. Impact: Causes flea allergy dermatitis, anemia, can transmit other parasites. Treatment: Flea control products such as fipronil, nitenpyram, or selamectin.

Life cycle: Spread through saliva, nasal secretions, urine, feces, and milk from infected cats. Impact: Causes immunosuppression, anemia, and lymphoma. Treatment: Supportive care, no cure, but prevention with vaccination.

Life cycle: Oocysts ingested, release sporozoites which infect epithelial cells of GI tract. Impact: Cryptosporidiosis, self-limiting diarrhea; may be severe in immunocompromised. Treatment: No specific treatment for animals; nitazoxanide in humans.