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We see a lot of runny noses in cats, and the top four reasons that I see runny noses are, first, infectious problems. Most of these problems are going to be viral in nature. So we see a lot of herpes, calicivirus, things like that, that can actually cause runny noses and discharge in cats. We also see bacterial problems. Fungal issues can cause nasal discharge as well. The second reason is going to be allergies.
Kitten diarrhea typically comes from either a parasite problem or a dietary problem. 1  Hookworms and roundworms (both long, white worms that damage the intestines) commonly infest cats. 2  Tritrichomonas, a protozoan parasite, can cause persistent diarrhea in kittens. 3  Giardia is a protozoan parasite that can cause diarrhea in kittens. Metronidazole usually works to treat this parasite (although resistance is becoming more common). If your cat doesnât respond to metronidazole, this is not the problem. Have your vet run a giardia ELISA test to be certain.