Pichu had blood in his stool a while ago. I was ready to take a sample to the vet, but I gave him some pills first (if I only remembered what exactly), at the vet's suggestion. In some days, when I was ready to take the sample, he was ok. So, the vet suggested if I notice again, to call him. But dear kat is well since then I sure hope Fister is going to be ok in no time.