I am watching my sister's dog who was diagnosed with a Urinary Tract Infection about a month ago. She finished her pills and was fine for awhile. But this week while I've been watching her, she started licking herself again and takes longer than usual to go to the bathroom. My sister gets home Monday, can I wait until then to have her take her to the vet and handle it or should I do something before then? Is there anything I can do without taking her to the vet and incurring that cost?