Most rashes will begin clearing up in about a week, especially when treated with a hemorrhoid cream. If a rash hangs on longer than that or starts getting worse, you need to see the vet because your pet is probably getting an infection.
Applying an antibiotic ointment is the easiest way to clear up skin infections. The problem is that pets often lick off the ointment before it has a chance to work. So your vet may recommend oral medications instead.
It isn't normal for dogs and cats to have frequent constipation or diarrhea. If you suspect that one or both of these conditions is causing the rash, your vet will probably want to do a variety of tests, including x-rays and blood evaluations, to see if there is an internal problem. Take a little of your pet's stool with you when you go to the vet so that he can examine it under a microscope to see if tapeworms or other parasites are present. Make sure that the stool is no more than 24 hours old.
Intestinal parasites aren't that hard to treat, but it is tricky to rid the house and pet area of fleas that transmit tapeworms. Your vet may recommend giving your pet oral medications that stop fleas from reproducing. Over time, this may help prevent rashes from occurring. See also: Constipation | Diarrhea
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