I have an 8 year old choc lab. In the manner of 2 weeks, he has gone from healthy to having trouble getting up on his back legs. When we took him to the vet,he said our dog needed to lose weight and he would be okay (we agree he is overweight). But the past couple of days, he can no longer stand without falling, he is peeing all the time, and sometimes even on himself. Today he can't even get up to poop. Surely this isn't all because he's overweight (104 lbs). I plan to take him to the vet Mon, but perhaps someone can help me sooner. Thanks