On Saturday De Dawg went wandering up de road because her undoable clip undid. But she has brilliant recall so came back when I got onto the pavement and sat down and called her, and someone went to get her tether then held her while I bottomed down into the house to clip her on. Yesterday was, I think, the second time one of her undoable clips undid but I do not remember where she was at the time. So I put a very strong carabiner on the end of her tether before I undid the tape and the knots that held the carabiner to her tether. This afternoon she went wandering down de road to my neighbour. Somehow I had not clipped the carabiner on properly? So yelled for neighbour, sat on her yard and called for De Dawg. Who came, well she would of course. So neighbour comes out and drags De Dawg to my home and clips her on then comes back to help me up from sitting on de ground. Later on de mail man brought be a sack of cartons but dis be de son or brother and is not sure of De Dawg, so wanted me to go out for the sack, bring it in and empty it and hand it back. Which I did. I then called De Dawg in but the door would not shut as her rope tether was caught in the doorframe. Opened the door slightly to pull it in - and there was no Dawg on the end. De Dawg was sitting behind me.
Dis Dawg is gonna be de deff of me. There is no way she could unclip that first clip once, let alone twice. Or three times. I forget already. And lousy hands or not there is no way she could undo the bit strong calaliber rope . Unless she be magic dog? Her be up for auction. Ackshully free. Wanna get her com an' get 'er free.
We had a similar problem with the trigger hook on a lead, a couple of years ago. It seemed to work well enough, though a little stiff, but every so often it would detach itself from the dog's collar. We scrapped it, and it is now hard to remember exactly, but I think that the spring occasionally popped out of alignment, which let the clippy bit, (sorry to use technical jargon), go floppy. For peace of mind, I would replace it.
Do not use trigger hooks any more. Use these. They close across themselves like a crab claw only three have now undone themselves but I cannot see how. Now am using strong carabiners but they do not swivel so her rope gets twisted. Only yesterday they have started undoing themselves.