It may come to that soon! Lol.
Not for a million dollars.
But seriously, I think the breeder erred, and possible failed to provide support and guidance. I think the OP got caught in an awful position and I just think we should be aware of that when providing guidance. As someone who euthanized a young dog following a vicious attack on a passerby, I can tell you that it is life changing. In my case there was no breeder and no good option but the end result is the same and I still have to live with all the what ifs.
I am simply suggesting that the OP deserves compassion, not condemnation.
^^^^^^^^^^^^ I offered compassion on first page lolSeriously though, you must feel terrible about this and I'm sorry for your loss.