While not always completely normal, it does happen. Puppies do it to their littermates, and some try to do it with us.
My new puppy is about a month older than yours. We worked a lot, on her not thinking everything would be taken from her. That way she feels no need to protect prized objects, or run away with them.
I did this, even though she was not showing signs of guarding objects.
If something is not a danger to them, I don't rush up, and pry it out of there mouth. Instead it let them keep it a little while. Talk to them in my play voice, and play with one of their toys. They normally come over to see what I'm playing with, and want it. I give them the toy, and take the object. Make the object seem like fun, and return it to them. Repeat the process a couple of times, and then the object disappears without them noticing.
This way I have got what I wanted, and they believe I can be trusted with prized possessions. 99 percent of things are not going to hurt them, so they get tons of practice. When that 1 percent shows up, they are already accustomed to giving you things.
The only time Shine showed she really, really wanted to keep something. She was about 10 weeks old, and it was a meaty bone. I didn't hear any growl, she just would chew in a frenzy state if I got near. I left her alone for a couple of minutes, and then got a second bone. Sitting on the floor, I made the second one appear awesome. Saying mmm Shine, this is so good. She left the first bone, to see if mine was better. I lightly held it while she chewed on it. Then released it to her. Gave her a minute, then did the samething with the first bone.
She learned, she has no need to protect, or run away, with prized objects. She will now happily lay on my lap to chew her bones.
Your starting this a little later with your pup. But if he has a stable temperament, he should be able to learn to trust you.
I would personally contact the breeder, and let them know the problem your having. Also ask them for idea's on fixing it.
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