they are not killed...they simply put an end to a dogs suffering.

keeping them alive wile their suffering is far worse and evil.

im not saying ur dog is suffering but Be4 you get a wheelchair for ur dear dog i suggest you go to a vet for an opinion, if the vet says hes ok apart from not being able to walk then get him a wheelchair...he maywell live happily in that for another few years yet

but if the vets see's something else wrong wiv him other then that, something that perhaps is hidden thats making him suffer in silence, then maybe you should then think about putting him to sleep