not sure if its a guarding or just wants the other dogs to let him just lay down with out being bothered, when hes tired and wants to rest. he has never had any issues with toys at the park before, but a few weeks ago he was trampled when one of the owners threw a toy close to him and 4 dogs ran him over. since then he doesn't like other dogs to approach him when hes resting with toys of any kind. we go to the dog park and he some times will growl at other dogs but nothing more. , but other  times he dose let other dog walk calmly over to him with toys    .

i do make him leave it alone, and make him sit for a few minutes then release him. i usually happens when hes super tiered and the other dogs don't take the hint to leave him alone. should i be worried ?

He is probably just tired of playing and letting other dogs know to leave him alone. Mine does the same thing when she is tired. My dog is a resource guarder and if a dog walks near her when she has any item of possession she attacks. Your dog let other dogs come up to him when he had a toy so I would say he does not resource guard. Also if he did I am sure you would have seen this behavior already at some point.

thank goodness, i was staring to weary. that's very good to know ill just keep my i out, so he dose over do it. . (sigh of re-leaf)