I don't have a problem putting almost any suffering animal down myself, but a dog or house pet is different. The last dog was Gypsy, a 90 lb Malamute who stole our hearts when she adopted us. She was about a year old when she came into our lives. She had a good 12 years with us, and was diagnosed with cancer in her sinuses. We treated it as long as we could, but one Sunday night she started having seizures about an hour apart. I called the night number for Vets, and we managed to get her to one at 1AM. My wife and I held her until the end, which went very peacefully. Next morning I went to the Vet's office, brought her home and buried her under her favorite shade tree. Damn, I can barely see to type now.