Will Falconer, DVM Moderator
Hi Lee,
These guys with DM are nothing if not sad cases. The few I've had have just continued to slip slowly but surely into paralysis.
But I can tell you that heartworm prevention is the very last thing I'd worry about! If you've never used it to date, I'd sure not start now, in the face of deteriorating chronic disease.
There are no short answers or advice to give for chronic disease like DM. Dr. Clemmon's protocol is the best I know, and I'd couple that with seeking out a veterinary homeopath who'd be willing to prescribe for Dax. Please look for the AVH list on my Resources page and see if someone there would be willing to help you.
All the best