Hi guys! Thought I'd share some of my own experience with our diagnosis of DM approximately 6 months ago. Something I've seen that hasn't been mentioned here yet is how to maintain mobility for as long as possible when you're dog's system is slowly shutting down. We're about 6 months into the diagnosis so I'd say we're in the middle stage. Our dog still can get around but has noticeable difficulty doing so - and forget about getting in and out of the car!!
Our vet recommended that we look into buying an rear support harness, you can hold the handle for the brace with the same hand as you hold the leash, and can help to support some of your dog's weight while they walk which makes it easier for them. It also made it possible for me to be able to keep taking her in the car with me when I'm by myself, as alone I couldn't lift her up by myself (she weighs about 80 pounds!!)
I know this is just a temporary "remedy" and not an actual solution, and at some point in the near future it won't work for us anymore, but for the time being it's been a Godsend. Just thought I'd share in case anyone else had heard of using a support harness and was wondering a good one to buy.. or for other people who maybe had never considered this option before!