Modelled by Lucky Marty Hotdog AKA “ALPHA”. Worn over his “Long Gray Line” Thundershirt.
When his head is no larger than his neck, he can slip any collar that’s not choking him.
Same for every commercial harness we tried. He had learned to back out and slip away.
To make matters worse, he’s a killer mad wolfhound, attacking any other dog he can sink his teeth into. How many other dogs’ vet bills have I paid?
And he’s a runner. The last time he got loose, dog-catcher picked him up hours later and miles from home. Hence:
Necessity is the mother of invention.