Thanks for your response.  I think what is difficult is that we didn't increase his activity at all, he has only gone out in the yard to go to the bathroom and has otherwise been confined inside, he has struggled on some sections of hardwood, but we have sticky mats and carpets down almost everywhere he goes.  He was very mobile prior to the Mast Cell Tumor and only declined as the tumors worsened.  We are rural, in Durango, CO, and I did a search for rehab therapists in our area and didn't find any.  I have palpated his whole body and don't get any obvious pain response anywhere, he does enjoy the massage - that is clear and I try to do it as often as possible.  He is scared of water, so I don't think we are good candidates for water therapy.  He is on Rimadyl, 2 doses daily (have to check exact amount), although we stopped because we didn't see any improvement, and then he seemed to get worse, so today we are starting back up again and tracking it closely.

I see that others have experienced a similar story.  I am just worried because we don't have access to the same rehabilitation care here, we didn't allow him any more freedom than he has right now and we don't see a way to really restrict him further...And if it was a soft tissue injury why would it be getting worse?  I am going to to the hot towel massage and stay with the pain-killers for a week and see what happens.

Thanks for the input.  Ollie's general mood is good.  He is clearly disheartened (my interpretation) when he can't get all the way to the back of the yard where he wants to go to the bathroom and is falling a lot.  But, inside if he can get to where I am he is in a good mood, tail wags, falls asleep near me as usually.  He enjoys massage for longer than usual - he has never been a snuggle dog, always very independent, very wolfy.  He was very spunky when I tried to groom him and I had to stop because he was moving around so much that I didn't want him to hurt himself more.  He does get up, turn around, and lay down so much more than normal, it seems he is readjusting a lot.

We saw a holistic vet in Durango when Ollie was first prescribed with Mast Cell Tumor, but besides some herbs it wasn't a very fruitful visit.  A rehab specialist recommendation would be great.  We are mostly just keeping him contained, we built him a ramp (we just have 2 steps), but he doesn't like it and when we section off that part of the house he RUNS to get into it as soon as the door opens ,causing him to collapse and struggle - so his attitude is 'let me at this' sometimes.  But, he also sleeps most of the day and can seem depressed.  Eating, drinking, and pooping as per normal.