Dog wheelchair

I typically not the type of person to do something like this, but a close friend of mine has a dog atlas who has had some unexpected medical issues and not needs a wheelchair between this and the vet and medicine things get quite expensive and i want to be able to help out at much as I can. I want them to be able to get a nice wheelchair for atlas and they are not exactly cheap. I'm asking for enough for them to get a wheelchair about $300 and any extra will go toward other expenses for atlas.
Any help is appreciated.
Thank you