Our dog has been ill for a couple of months during which time we had taken her to our usual vet 3 times, had two urine tests and three courses of antibiotics. The vet said it was a UTI but the antibiotics didn't help. So I took her to a new vets' practice that has xrays and an ultrasound scanner. They have highlighted the issue - with a definitive diagnosis - and are suggesting a biopsy. As this vets is far more expensive and we've been with our old vet for 6 years, is it OK to swap back to our original vet to get the biopsy/surgery?