You can test pH and get an idea if the dog has an issue brewing. PH > neutral usually spells trouble ime. I can also test for the specific gravity here (thanks to my real work) and that tells you if their kidneys are able to concentrate the urine. I once missed a UTI and it took 3 mos for the kidneys to recover that function.
The best thing to do would be to drop off a urine specimen to your vet tomorrow. Get the first urine of the morning and drop it off as soon as the Vet opens. They'll do a dip stick, specific gravity to check urine consentration and also a spin down to check for blood cells and other types of cells, bacteria, and crystals. I would not give your dog anything that may change the urinary ph until the urine is tested as you would not want to mask anything that may hinder diagnostics....JMO good luck with your dog!
