Surprisingly she brought the subject up. She said she serously needs to do something with the dog. I suggested that it needed to be out down and she agreed. That is really good because I was feeling guilting about the idea of shooting the dog and then lying to her about it. I have no problem shooting it. The lying party is different.
Tomorrow I am going to the vet with her to do the dead. I have to pretend to be compassionate. It is going to be a great day for for. That dog is a jerk.
Sucks that it had to come to this but I am glad you are taking it into the vet to have it put down as opposed to putting a bullet in its head. Not that I would consider you a monster if that is the way you handled it, but it isn't necessary in this situation and I think this is a much better way to go about it. Better than the violence of the firing squad anyway.
Should be much easier on your mother as well. Giving her some time to come to grips with it is much better than if you would have shot it and lied, leaving her to worry and be upset about what happened to it/giving the false hope that the dog may turn up. The emotional stress it would have caused your mother in that situation would be cruel and does not fit in with what I know of you as a person.
Anyway, it's a shitty situation and I'm sorry you have to deal with it but I think you are doing the right thing and doing it the right way.