I'm sorry you're having such a very rough time of it, and that you have difficult decisions to make regarding your future living situation. I'm sure you can find good homes for your pets, but it might be a little early to be concerned with it. Many assisted living places and even nursing homes accept family pets these days. In fact that's one of the questions you could and should ask about any potential place, since pets are so important to you.
Many people with chronic illness actually flourish when they are in a less demanding home environment! You might find it amazing to be in a situation where all your needs are anticipated and taken care of, plus with plenty of company and activities. It could be a very refreshing and uplifting change of pace for you, and it might be something to consider doing while you can indeed still walk. In fact, you might get enough physical therapy that way to actually improve.
Remember, with scleroderma, its never over til its over. The illness can stabilize or turn about at any time. There is no such thing as natural, inevitable progression, but rather a normal course of waxing and waning, even without any treatment at all. During spells when I seem to be worsening, I try to cheer myself up with the thought that it simply "must mean" that improvement is just around the corner! It's natural. It's expected. And that helps keep my spirits up and perhaps even has some slight influence in bringing about bits and pieces of improvements. Who knows? All I know is, it does make me feel good to think like that, or at least better than if I felt it was all doom and gloom and a downhill slide all the way.
I imagine you're probably just feeling pure dread at the thought of any sort of change right now. If you start perusing all your housing options though, you might find yourself intrigued. Set up tours. Visit during meal times so you get to see if the food is any good, and how cheerful the residents are. Avoid the centers where everyone is zoned out and drooling in wheelchairs, and gravitate towards the ones that have a full schedule of activities, or at least a few things you might enjoy.
The best thing about any new housing is that, no matter what, you'll still have us and all your friends here in Sclero Forums will be rooting for you to make a good adjustment. I'm sorry the thought of any change is even necessary, but it is one nearly everyone faces if they manage to live long enough, or live through enough, so in that sense, you are definitely not alone.