No differant then killing a cow ,horse or any other non needed animal.
It is up to the owner.
Biblically, we are to care for our animals,
but we are also given dominion over creation.
There’s a balance.
I don’t think there’s a problem with killing these dogs, no different than culling unwanted sheep, etc, as long as they weren’t tortured in the process.
yeah you farm people sometimes can be might crude
Its no more cruel than the way the animal shelter would euthanize them.
I know I would rather euthanize my dogs here at home if I had too. Its better than putting them through the stress of taking them to the vet.