My dog is used to all sorts of puzzles and dispensers.
The concept was not difficult for her, but she had to work a little with execution. She figured out to face the bottom of Santa's beard, pin the edge with part of her paw and pull the cookie out.
Once she cracked that code, it is a new favorite treat toy.
For a dog newer to these puzzles,
1) I would offer Santa on the floor with a treat in each pocket, and a cookie barely touching the pocket, so your pup just needs to nudge it out of the way.
2)Slowly increase difficulty by putting the cookies further into the pockets.
3)You can help, and show you dog where the treat is.
4)If your dog gets stuck, move back to an easier step.
Pretty soon your dog will be running off with Santa and emptying on their own!
This is how we train using puzzles in class.
Santa is well made and washes well (we got another one this year).