Dog UTI Treatment
I haven't tried any of the pet uti free products that can be bought online yet, nor do I know any that has so can't tell you if those work or not.
If you suspect your dog has a UTI, just go to the animal vet. They will do a Urine culture, checking for bacteria and give you antibiotics (I got clavamox) if needed.
The antibiotics aren't that expensive, I only paid around $20. What's expensive are the tests, so if you can get a sample of your dog's urine without contaminating it and rush it to the vet, you could save some money.