I unexpectedly had to put down my 12 year old german shepherd mix on Thursday. I got married a year ago and my dog stayed at my parents, I felt the move would be too hard on him from a suburban home with a large yard to an apartment, but I would go home to visit almost daily. I stopped home Thursday and he was laying in his pen in the garage, the garage smelled terrible (not totally uncommon as he occasionally has had accidents in his pen in there and it would need a few days to air out), he didn't get up which wasn't unusual because he has had stiffness in his back legs for a few years. I went inside and talked to my dad, my dog never made his way into the house. I said to my dad the garage smells did Bandit have an accident again, he said he wasn't sure and my mom was afraid that the smell was coming from Bandit himself. My dad and I went outside and tried to get him to move from the pen to the backyard and he wouldn't move. We opened the door and I tried to coax him out with a treat, still no luck. My dad and I pulled him out and my dad lifted him up (80lb dog), his back end looked all twisted and he couldn't stand for more than a few second. He had had an accident and had been laying it. My dad looked at me and said he thought it was time, since Bandit could no longer stand or walk. He tried to walk briefly and dragged his back end behind him. My mom said the night before all this she had heard him whining in the middle of the night but she was alone (my dad works some nights) and he was in the back yard and he eventually quieted down. I called the vet and told them what was going on and they said it was time and had me bring him in. He had a parathyroid tumor, had been diagnosed over a year ago and what was going on was related to the tumor. I just feel so terrible, like I killed him. The vet, my parents and husband said I made the right choice, and that things were only going to get worse. I just feel like I let him down, that there was something more I could have done. He just still seemed so alive too me, it all happened so fast. Just a few weeks ago we had gone on a half mile walk, I knew that was the last walk I would take him on since when we got back he couldn't get walk up the steps into the house. This was coming I know, but I am in so much pain over it. I held his head while he died and he looked right at me, it was so hard, I just feel like I should've tried harder to care for him until he passed on his own.