Please help save Prince from being euthanized

Prince is a 4 year old pitbull with no history of violence or attacks. He never harmed anyone, never killed or bit a human or other animal. He has always been in good behavior. Now the city of Montreal animal control wants to categorize him as dangerous and euthanize him for doing nothing wrong.
My new neighbors called the city to know the history of my dogs behavior they never made a complaint on my dog, but the city decided to make  a complaint and sent animal control to my home. They evaluated my dog in my home and because my dog didn't want to take a treat from this guy. He decided that my dog is dangerous. My dog never attacked this man he just didn't want to take his treat (he didn't bite him, didn't jump him, didn't attack him). Now the city wants my dog on a muzzle until May 30th 2019, the day they said they will take him away for an evaluation and then what we were told be euthanized... however they have added that we would have to pay 465$ for the evaluation and then have to pay the city 600$ to euthanize him and another fee to have the dog cremated. But my dog didn't do any harm to anyone ever. We have put ourselves with one of the best lawyers in Montreal to save prince from this unfortunate fate. However that also comes with a price and are asking for some help. Please help us save our family member and my son's best friend.