No improvement in urinary tract infection male beagle 11yo?

I have an 11-year-old male beagle who is being treated for a urinary tract infection. The vet said his urinary test did not look like an infection and did an ultrasound for kidney stones and cancer, but found nothing other than an enlarged prostate. He put the dog on two antibiotics (one before the ultrasound and a second added afterward) and assumed that since he found nothing else, it must be an infection. He's been on both medications for a week+.

Lately I haven't seen any blood in his urine, a very good thing - but I could simply be missing it. He still groans when he pees and has to stop and start multiple times. It still comes in little spurts, which seems to put it at a weird angle because he's been getting it all over his legs and belly.

He'll finish both medications early next week, but doesn't seem to be better. He's shaky during the day and doesn't play or chew his bones anymore. He's still straining to pee and having pain. I know he's not done with the meds, but I thought symptoms were supposed to improve about halfway through a course of antibiotics (at least in people, and why should dogs be different)? I'm concerned that he'll finish the meds and still be sick. Look at my previous questions if you want a comprehensive list of his symptoms. I'm afraid this means it really isn't an infection, and that's why the vet didn't see it in the test. What can this mean? What should I do to make him feel better, and what can I do to make him get well faster if this is an infection?
 
Sounds like a Urinary tract Infection to me..What meds is he on? Could you try feeding him can food?What type of food is he on?If he's on grainy dog food try something grain free.You can try giving him 1/2 tsp of Apple Cider Vinegar one time daily for three days straight.Since he's on meds you might want to get some probiotics for him.When you give him ACV be sure he eats first before you give it to him.
 
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