My last dog was a rottie. she was playing with the cats and slipped on a hardwood floor and split both of her front leg bones the full length.. the vet said she could not be fixed..I had her for 12 years she was very healthy not overweight or anything and was by my side every minute that I was with her..the only thing that hurt more than putting her down was when my wife of 56 years passed.. I said no more dogs for me..