Your dog needs more water so that the pee is undetectable. A dog which gets enough water, is not dehydrated and so like humans, will pee fairly clear. Catch your dog peeing and capture a sample for the vet to check. Yes, it is easy. My dog on leash (German Shorthair) kept her inside, pushed fluids, and when she whined to have to pee now, I leashed her up, put on rubber gloves in case she/I missed, and followed her out the door. I had a huge new disposable cup that when she squatted to pee, I got my cup full. She did not care as she had to go now. And did and gave the sample.