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I am sorry to hear you are worried about Spotty. I am a veterinarian and will do my best to help.
The first thing I would check her for is impacted or infected anal glands. If she is overweight, she may not be emptying the glands like normal.
The other problems I see in overweight cats is feces matted around the anus, causing both pain and a bad smell. Sometimes I have to clip away matted hair and feces with eletric clippers, never with scissors.
Is she eating and drinking normally? If not, I would check for a colon impaction. This involves putting on a glove, and feeling inside her colon. I could check the anal glands the same way.
Let me know what else I can help with or answer.
Good that she will let you look; many cats will not.
If she has runny stools, she is not constipated, but she may need to be treated with antibiotics, anti diarrhea medication, probiotics, and fiber.
You can try adding fiber to her food: canned unsweetened pumpkin, Metamucil. You can also try probiotics like Fortiflora, Proviable, or Culturelle.
Sadly, most over the counter pain drugs are not safe in cats. Tylenol, for example, is deadly to cats. The only pain medication that is safe would be 1/2 of a baby aspirin, if she is eating and not vomiting. You can do this only once every 3 to 4 days (yes, days!).
All other pain medications we use in cats are by prescription only.
The baby aspirin is the only safe pain medication I can suggest. It is anti inflammatory, and may help her feel better. I would rather use buprenorphine if she is painful, but that needs a prescription. Aspirin may help her feel better, and get up and move. You would have to try a dose to see if it helps her. I only give it if the cat is eating well.
I had a cat with terrible diarrhea, since he was a kitten. My research showed that canned food, or food containing fish were not recommended. He was greatly helped by the special diet made for diarrhea called Royal Canin GI.
Can I help with or answer anything else?
How is Spotty doing?Rebecca