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Hello. Thanks for the question.
It's not uncommon for some of these corporate vet hospitals (VCA, Banfield) to have protocols that they must follow. It's probably their protocol to have a urinalysis every 6 months for Proin. This is a prescription med, so you do need a veterinary script to order it, even from online pharmacies.
If you don't agree with the every 6 month urinalysis requirements, then I would use a different vet. I would go with a private vet as opposed to a corporate vet. They are much more lenient with their requirements. Yearly urinalysis is ideal, but I know a lot of vets who are just happy to examine the dog once a year for something like this that is pretty commonplace.
I hope this helps, let me know if you have any other questions.
I practice in Michigan. I don't know anyone in that area personally, sorry.