This is the problem for Poot and Dodger. The OP is right, the magnets on these doors are very strong. Like the OP my cats can push through it but the dogs don't seem to understand they really need to push hard to get it to move. So I am going to also remove the magnets ( when it gets warmer in upstate NY) and try that. I think Dodger will get it with a little food encouragement. Pooter will be a bit more of a challenge. OP, 12 days is not long. Pooter is in her third year here, Dodger his second. I had one hound who never, ever learned to do the dog door. I think he was the exception rather than the rule. Most greyhounds can easily learn a dog door.
Keep at it.
Edit to add I have the same door as the OP.