i had no chioce i had to put my beautiful 5 yr old black lab down he had cancer and we didnt even know it until it was all through him. he had no symtoms until the end in fact he was a little overweight until the end ."the end" only took 2 -3 weeks! it was devastating but it had to be done,he really suffered the nite before we did it. we took him to the vet and he went very quietly, i sang "over the rainbow"(tried and cried) to him as he passed.