Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
Before trying to treat a problem that isn't really a problem,
it's important to recognize that simply having an elevated urine pH does not automatically mean there's a problem.
IN dogs, many times where the pH is significantly and persistently elevated, may be explained by a bacterial infection, so a urine culture should be performed to identify such a possibility.
If there's no stones in the bladder, and the culture does not grow any bacteria, then treatment is not likely to be required.
if bacteria are grown, then antibiotics would be needed.
if an x-ray or ultrasound hasn't yet been done, that needs to happen as well, to check for stones.
if stones are present, surgical removal and/or the special diet would then be necessary.
There are several brands of prescription diets which can help prevent some types of stones, but again these are not specifically intended for the purpose of lowering urine pH with no other disease present.
an oral methionine supplement as you mentioned, could be useful as a urinary acidifier, if needed in cases where a patient refuses the proper diet.
Thank you for that, I obviously didn't make myself as clear as I should. Brynni has already had 2 episodes of cystits and we have been told that she has a significant growth of crystals which need to be controlled before stone formation takes place, this is why we thought the suppliment might help.