Last night I noticed one of the cats had really bad smelling diarrhea. Today I monitored the litter boxes and found out it's Rocky. He's gone at least three times so far today and I'm almost positive it was him who vomited on the carpet (partially undigested food). He isn't acting sick in any other way. He isn't doing anything out of the ordinary. Should I take him to the vet immediately or wait and see if it persists for more than a day?
How could I get a sample of it to take to the vet?
How could I get a sample of it to take to the vet?