i don't know

i hate to verbalize this.
the moment i've been dreading for most of my life is drawing very near. i can feel it. this morning i was watching candy trying to eat, struggling to keep her back legs from slipping out from under her, but to no avail. eventually she sat down to eat. i just picked her up, hugged her, and cried. i don't want to have to put her to sleep, but i also don't want her to suffer. i was looking at dog wheel chairs online today. all the dogs look happy in the pictures, but of course they can see. i think that if i get her one it will just cause her more trouble. the other thing is that when i put her outside her legs don't slide out because their is more friction, but you can see her legs shaking because she is trying with all her might to stay standing. she's lost so much muscle over the last year and a half.
i just don't know what to do. death is such a terrible thing to go through.