Heh... I've never used the greyhound collars, but they'd sure work on a dog like Gidget, whose neck is bigger than her head. I intentionally keep them pretty loose, too, so when she's loose in the yard, she can pull out of it if she gets hung up on something. If I'm walking her where she might get loose, I tighten it up or use her pinch collar.
Heh.. and she didn't really flip me off and go home :~D
She was just bein' lazy... and a little bit sore. Like me, we're both out of shape.
Oh, I'm sure there've been times when mine would have flipped me off when they could. ;o) Not while out walking, though. I'm the one who could use lots of energetic walks. Between 'em, the dogs get in plenty runnin and wrastlin.
My current pets do fine so far with browsing on dry food always kept available to them. (It's a shame the same strategy doesn't work for me!) Once the lab gets thick-bodied, as they tend to do after a few years, I may have to adjust the food or amount.
One thing I've noticed with Purina's Indoor Cat Formula, my kitty doesn't hack up furballs at all, and her coat is medium-long. Very nice.