My 8 year old mabel needs to be put down she has a large hard mass in her vent area I have checked it’s not a edd she looks like a penguin when she stands mabel is sleeping a lot not much movement but will eat. I can’t cut her head off i Would keep my eyes close the whole time and probably cut my hand off in the process. I do have a pellet gun I don’t know if that would work and if it did what Part of the head do I aim at. This is what I have