M.H.
Hi Victoria,
I haven't had this problem but my lab has been living with heartworms for three years and is doing fine. (Yes, he was given the regular heartworm prevention and no, it didn't work. We now have him on a doggie vitamin and garlic and he's fine.) There's hope.
This link http://www.howtodothings.com/pets-and-animals/a3350-how-t... said exactly what you said and outlined some causes you may want to investigate. It also said that the signs of the canine stroke are usually gone within several weeks.
There is a lot of information on the web on how to tend to your animals day to day without the expensive vet bills. I've spent $30.00 at the health store when my vet has prescribed something that would cost $400.00. Obviously, my experience with the vet's heartworm prevention gave me a different perspective.
Sorry your furry one is dealing with this...
M.