The yogart will help the bacteria problem, plain yogart not fruit flavored stuff. We use non-fat so it doesnt put added weight on. Also, pumpkin pie filing (pure pumpkin) a small spoon full on top of yogart (I call it pumpkin pie treat) 2 times a day. Pumpkin binds and it works

I don't know about bottom problems any ointments to use, that I'd check with your vet.