It's actually a Filson waxed canvas shooting vest. I probably would not have sprung for the "very best" on my own, but I made covetous noises about it when my sister was in earshot one day and it appeared under the XMas tree four months later, and I absolutely love it.
I can have all my field gear -- elastrator, ear tag pliers, scale, gambrel restrainer, rings, ear tags, syringes, needles, BoSe, etc., within easy reach and keep both hands free at all times.
This is Tweed's third year as my lambing dog. He's always enjoyed holding a single sheep and loves the contact involved. The two other dogs that I've tried either want to bring the ewe down or just leave it alone, neither of which suits my purpose too well. I really think it is the rare dog that really likes lambing. Many can be trained to do it, but like Janet's dog may opt out at the worst possible moment, or like my other two guys never really get it fully. And some simply can't do it, no matter how much training effort you put into them.