That's just an elevated, mesh dog bed, Kyle. An extension of "sit," "stay," & place-board obedience training we've been doing on a daily basis. At 13 weeks, she has learned the command and we are now at the point where we keep extending the time and have introduced more and more distractions while she is on "place"
The long term idea is that when she has been given the the "place" command she needs go to that place and get all 4 paws on it. If for an extended period, the dog can sit, lay, etc, but needs to stay on that place.
Beyond the obvious adaptation to her "place" in the boat or a blind, it becomes a useful behavior in the house for everything from control when someone rings the front doorbell, to getting out of the way of the person loading the dishwasher (instead of hopping on it to lick plates every time someone is loading it).

Wives appreciate that.
For field-trialers or hunt testers, the longer term adaptation would be the transition to steadiness at the line with no creeping.
Right now we rotate by using the place board, the truck-kennel pad (which also serves as a spot to lay on in the house), and this elevated mesh dog bed.
IMO early obedience training is more important that the retrieving play we're also doing. I'm impressed when people tell me how their 5 month-old pup can do a 125 yard mark; but not so much when that same dog at 2-yrs old can't sit still for 5 minutes, is completely out of control, or bolts into the water every time a gun goes off.
View attachment Mingesfarm.jpg View attachment Pboard.jpg