Our lab mix female has constant symptoms of uti. Though the last time a different vet at the same clinic diagnosed vaginitis instead of uti. Our mix is spayed but they suggest a nip and tuck down there because urine pools in the loose skin around that area. Something to suggest to your vet. Also the vet did a vaginal swab and cultured it to find the right antibiotic, which turned out to be Cipro Hope this may help.