Some dogs just like to collect things … I think this one is collecting kindling for the campfire!
We have a Labrador Retriever, just like the dog above, and she can hold a LOT of things in her mouth too.
Whenever we take her to the beach to play with other dogs she literally steals all the other dogs toys and holds them in her mouth as she teases them and gets them to chase after here. I’ve seen her with four or five toys in her mouth at once.
Is your dog like this?