I'm not sure if they are out yet on the market.
I have hunted with one quite a bit though. A prototype.
It's not so much that it's a puppy that brings predators to it. It's draw for predators is that it looks like an animal, (pretty generic laying there on the ground) and it makes excellent whimpers that is of medium low volume.
I think it would be a huge help to guys that hand call. They can quit calling and let the puppy finish bringing the coyote into the stand, without having to use a coaxer, so that they can concentrate on the shot...
For guys using an electronic caller, you can mute the caller when the coyote has committed to coming in and do the same thing. Let the puppy be the coaxer that finshes the deal.
Don't laugh too hard at it till you've seen some of the footage shot while using it.
There will be Mojo Outdoors TV show coming soon that was shot with Barbara & I that has the coyotes just going nuts and charging the decoy, circling the decoy at a distance of 1 foot, and one that jumps straight up in the air as it's coming in, just to catch a glimpse of what is making that movement and noise...
It adds an animation of reality to the stand....As I said, it's not the "puppy" aspect that makes it work. Anything that has four legs and adds animation to the stand will work.
Barry