Our dog is sick. She started peeing in the house a couple weeks ago. I put her on antibiotics, assuming it was a UTI. Then she started throwing up. We ended up having to put her in the garage because we couldn't leave her alone because of all the messes. Now her gums are swelling. I took her to the vet and they don't know what it is. They have run all the normal tests/blood work and have ruled out infection, diabetes, kidney problems and her white/red blood cells are ok. The vet had me start her on yogurt and pumpkin and glucosame because her tests say she has some inflammation and a lot of gas. She is probably 9-10 years old and has a lot of issues (she takes thyroid pills 2X/day, allergy shots every 10 days, etc.). She is a purebred and the vet says her breed typically doesn't live beyond 11-12.

The next step would be very expensive tests. We are torn between wanting to fix what is wrong or thinking that it will just go downhill from here. We can't bring her in the house until we get the peeing thing figured out. She doesn't seem to be in any pain, but when I take her for long walks she spends all her time trying to pee and can't. We are trying to decide if we should put her to sleep or go ahead with the tests. What would you do?