While I'm all for natural remedies, I definitely recommend seeking out a vet if UTI symptoms crop up in your pooch. I frequently use natural remedies for myself when treating a UTI, but I also know what's wrong with myself and force myself to drink tons of water to flush things out. Unfortunately we can't do this with our dogs.
my dog has had UTI's before, so I just assumed he had one again. After trying d-mannose, cranberry, ACV, kefir and increased water on my pooch to no avail I took him to the vet. THANK GOD I DID! His X-rays revealed 8 bladder stones one of which was lodged in his penis and he had to be operated on immediately to avoid going into Kidney failure.
I'm so grateful I didn't chance it, and wait any longer. Apparently certain breeds are quite prone to stones, so taking them to the vet is definitely worth it. Yes it was expensive. X-rays and bloodwork $650, surgery etc $2000, but I still have my Chewie! <3 As vet owners we can do all the reading we want, but there really is no replacement for things like blood tests and X-rays. So remember to keep that in mind if after a few days your dogs symptoms don't stop. Or maybe try one of those home uti tests to see if he or she has one, and if not get her to the vet ASAP.