I have an 8.5 year old Shih tzu, whom I've had for 3 years. The previous owner warned me that she had skin allergies and she has been scratching ever since.
Starting 4 months ago, she was having a lot of diarrhea, sometimes with blood or mucus. It would be there for a day or two, I'd take her off food, then ease back in with rice, then chicken, then slowly adding her food. And she'd be fine for a few weeks, then sick again. Now she's not even fine for a few weeks before it starts again.
I have had numerous trips to the vet. We did fecal test, blood test, etc and everything was fine. I tried returning to a food I know did not make her sick, but did't matter. I know she's not getting into food that she shouldn't. Finally I did allergy testing: she is not allergic to any food at all. She is only allergic to three kinds of weed (which makes sense with all the scratching). The doctor is recommending allergy shots with the warning that they may not work.
So I guess my question is this: is it possible that these allergies to weeds are causing my dog's diarrhea? Or is there something else we haven't tried? I'm getting really worried!
Thanks.
-Rachel