My kitten is five months old and has had massive diarrhea since we got him at two months. He's been to the vet several times where they've checked his stool and have given him several medications including tylan and more. Nothing has helped, other than the diarrhea, he's perfectly fine and happy! I have no idea what to do, the vets have no idea what's wrong with him and it's all the time, and he doesnt make it to the litterbox 75% of the time! Any help would be HUGELY appreciated? He eats Wellness dry food and drinks plenty of water, we also add Fortiflora to his food. His stool is liquid light brown.