What about piddle pads? They're very absorbent, with a backing like diapers that won't allow the urine to leak through onto the flooring. You can also get "underwear" similar to diapers for dogs with bladder control problems, though Pampers are cheaper. Just cut a hole for the tail!

Would your vet prescribe antibiotics without a visit? Or like Sandra said, our vet will accept a urine sample from us, particularly since they get get one from our dogs .