As cats age, many get chronic constipation and will poop outside the box to let you know that something is wrong. I give my older cats Miralax (1/4) tsp sprinkled on top of food - recommended by my vet. It is working great. One cat will not eat it food with Miralax mixed in the food, so I...
I had a similar issue with one of my cats, until I found out (purely by luck) that when I switched him to a food with NO GLUTEN, the diarrhea stopped within 12 hours. I now have all of my cats on a Gluten Free Diet. I use Fancy Feast canned - "Classic".
My cat had consistent diarrhea.... long story short (and after $$$ spent at the vet with no relief), I discovered that when I fed him food without gluten (or wheat gluten) in the ingredients, the diarrhea stopped immediately. You must read labels carefully, but it seems to be the ones with the...