My 16 yr old beagle , Joey, was diagnosed with bladder cancer a month and half ago. He was doing well up to a few days ago. He can't make it on his long walks anymore. He makes it just far enough to pee and do his business than becomes really weak. I have to carry him up the stairs. I noticed he is shaking when he's done. I can't tell if its because he is pain, is scared or both. He is quiet otherwise. Just shakes and seems worn out. It lasts about 15 minutes . I'm scared. Does this mean his time is coming near? Anyone else see this symptom???