My boxer fucked his knee, limped and it slowed him down, people said put him down, it's better for him, what a bunch of retards, I knew and could read that dog better than any one in the the world, his eyes said 'I want to live' he loved every minute of life, so I spent a fortune on surgery and rehab to extend it for him and I'm fucking glad I did it.
My tight arsed brother in law suggested way too many times to put him down cos surgery is too expensive, so eventually I made him a suggestion, which was to shut the fuck up, stop telling me what to do with my dog and start minding your own business or I'll put you down.
Moral of the story, don't be telling people to kill their pets, it just makes them want to stab you in the head with a rusty spike.
That's just my 2 bob opinion on the above subject.