I had the hard decision to make over my late lurcher, he'd been with me after being rescued off the plain ten years prior, we did everything together, work, shooting, and even dating !!
When he had a bad stroke that left him blind and incapable of standing, and crapping himself, literally, I had no car on the road at the time, and the vets wouldn't be able to come to me for at least four hours, I wasn't going to try and stick him in the crate on the back of the quad and ride the 12 miles to the vet, so took the painful decision to end his suffering myself, went to the cabinet, loaded up a few .22 subs in the 10-22, and did it myself, in the back garden, hardest trigger pull ever, and never used that rifle again.
It was a single shot to the brain, and I held him till his heart stopped beating.
Do I feel good about killing my dog ? No, he'd been a big part of my life for ten years.
Do I believe I did the right thing ? Yes, I couldn't watch him suffer.
Did I worry about the legalities ? Hell no, I just wanted to end his suffering.
My Licencing dept were made aware of it as I'd told them when I sold the rifle, and used the slot for something else.
Would I do it again ? I don't know, it's one of those 'need to be there' times.
Regards
Pete