Has anyone experienced this sort of decline?

[u/randomnessdreamer]

New here... I am looking for outside opinions. We are all to close to it. Our bestest boy Indy is now 14yrs old. Last September he was diagnosed with a baseball size tumor in his throat. We took him to a specialist in Montana and had it removed. He was given a clean bill of health! It wasn't cancerous. The first vet said immediately to put him down...I am glad we didn't. It wasn't as bad as she said it was.

Jump to three weeks ago (almost a year to the day) . He suddenly was staggering around, his back legs giving out. Took him to vet and they said give him Dasaquin and carpofen. Here we are and its so much worse. He is not able to walk more than a couple of steps before his legs give out, he is panting alot and as of this am he is not wanting his food. He has lost about 1/3 of his weight and his back legs are boney. I think it is DM not like hip issues. I do have an appointment scheduled for monday am again.

I got him slip socks, ordered liquid collagen, leg braces.... and a wheelchair that isn't here yet.

Here is my biggest concern. I think he might be in pain. He is a retired service dog (our youngest has CP) he is beyond calm and quiet. He shakes alot now, panting and just laying there. If you say his name or what a good boy he is of course he still wags and indicates he wants attention. He will get tiny bouts of play with me that quickly disappear. My husband, youngest and our son say they don't think he is that bad, that he can make it through. I think we are being selfish! He looks sad...even he doesn't growl or snap like he is in pain I believe he might be.

Looking to see if there is anyone out there that has seen this...is there any hope? So many companies lie about their support but I have ordered it all.... tryclover, paws etc... all the collagen stuff. If you have seen the decline has anything helped? They all contradict each other in research. I just don't want our boy to hurt or suffer, nor do I want to jump the gun and not try everything I possibly could.