Let me start by saying Hudson is 4 months old and is fairly submissive other than regular puppy nipping/jumping. I practice things to avoid food aggression such as taking his food while he is eating for a minute, touching the food in his bowl, taking his antler while he is chewing etc. He has been biting and chewing more than usual, so I bought him a bison tendon today for a new chew. He had a beef tendon before, but we left it at a friends place and its gone now. We gave him the chew, I reached down and took it back, made him wait, then gave it back to him. About 10 minutes later DH reached down to do the same and Hudson growled and lunged at him and he bit him on the hand. I didn't see it happen, but I definately heard it! DH took it away and held him down for a second and he seemed fine as soon as the tendon was out of sight. He hasn't shown signs of aggression before, but I would describe him as fearful..
...so I guess I'm wondering if I should be really worried? I want to know what I should do to prevent this, beyond what I am already practicing, and what would be the right reaction? I have a trainer hired, but she doesn't come until Oct 16. Thanks in advance.