I don't use a vet at end of life if they don't pass on their own.
They don't want to load up and go,the shots hurt the animal,more fear,more stress for the animal.
So I give a fatal dose of opiates wait until they fall asleep in my lap then shoot them before they can suffocate and possibly suffer.
Far easier for the animal much,much harder on me.
I believe it's the right thing for me to do else I certainly would not.
I also believe if more people took that approach maybe there would be a few less shitty owners.
Shitty people generally don't do the hard things.