It doesn't matter how nessesary the decision is, it is never easy to make. just try to remember all the good times you and your family shared with her.
It's so hard man. Everytime I put a dog down I swear I'll never get another. They are like family, hell my dog is more likeable than some people. I wish you the best and always remember the good times.
I'm sorry to hear this brother. Just like ppl we get mad and become impatient with them but they are loved just like those ppl. Different is no matter how mad we get with them they still love us unconditionally. If you ever just need to talk we are all here for you brother. To Greta.