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Hello my name is***** and I am a licensed veterinarian. I am hoping to help you with your question regarding your dog today. Are you still looking for a second opinion on the issue?
It is true that Rimadyl can potentially causes ulcers. This typically can especially occur if the dose is too high, or it is given to a dog while they are taking other medication such as steroids. With ulcers I would expect other signs as well such as vomiting sometimes with blood, or dark stools with diarrhea, and abdominal pain. Was your dog showing any of these signs.
Also regarding the anemia, it would need to be determined if the the anemia is caused by either blood loss, or destruction of the red blood cells, or decrease in production of the blood cells. With ulcers you expect that the anemia is caused by blood loss. This can be determined by blood work because, anemia that is caused by blood loss usually is accompanied by low protein and an increase in blood cells called reticulocytes. The other causes of anemia tend to have normal or increased blood protein. So I would have your veterinarian figure that out just to make sure discontinuing the Rimadyl is enough to improve the anemia
Do you remember how anemic he was ? Did your veterinarian give you a number? If it is a mild anemia then it is possible that it could be due to a slowly bleeding ulcer. If it is a moderate to severe anemia that is due to anemia I would expect him to be sick from it. Also if his anemia improves dramatically after you have discontinued it then that could possible prove it was due to the Rimadyl.
If he did have an ulcer and it was caused by the Rimadyl it is likely that it can clear up on its own since he currently is not showing any signs. If he were showing signs, he may need further medication such as gastroprotectants and medication to coat the stomach to help it heal faster. Usually mild ulcers will typically heal within a week or so. As far as his undescended testicle it can cause other problems especially if it is increasing in size . When deciding whether to remove it or not, you have to measure the risks vs benefits. If the testicle is not causing any problems then it may be too risky to have it removed. If it is proven to cause problems then it may be worth having it removed.