Euthanasia should be the last, last, last resort. I say this because my 2 Rottie girls fought and the only thing that broke them up was our male. I thought there was no hope for them. My son caught in the middle of the fights and was hurt. I tried everything, I was almost going to have the one that bit my son euthanised but I was determined to work with them. I knew my girls are good girls they just needed redirection. We started training all over again (NILIF is the best!!!!) and continue with training. Edgar has many great points!!