My dog is prone to urinary tract infections. After repeatedly spending $$ on vet bills, antibiotics and prescription dog food I did a lot of research and came up with a tea that I mix into her dry kibble (a good quality no-grain variety). Crossing fingers, but so far we've gone quite a long spell without a recurring infection. Here is what I came up with, not always exactly measured, and sometimes I add other herb that are diuretic. Make into a tea - less for when she is doing well, stronger when she starts showing signs (rubbing or chewing on her rump). What I don't grow/dry myself I buy in bulk from my local co-op. It is very inexpensive (another bonus).
1 part uva ursa, marshmallow root, dandelion root
2 part nettle, chickweed, parsley, echinachea