Our boy is a bit more than 5 months old and everything is going really well. He basically outgrew the puppy biting and is quite well trained. At the moment the biggest issue we have is resource guarding. It doesn't happen with food, it usually happens when we are out for a walk and he finds some trash. Of course I'm trying to avoid that he can pick it up in the first place but unfortunately there is a lot of trash, if it's dark I don't see it anyways plus he is fast. Sometimes he gives it up pretty easily but some trash he really values as treasure. When trying to get it from him he starts to growl, push my hand away, stand on his back legs and even snaps.

I'm trying to offer a good treat for trading but he doesn't care at all. Toys didn't work either. We are working at home at the 'drop it' cue but results are slow and he simply doesn't respond at all to it when we are outside.

We already have a lesson booked with a trainer but the first free slot they had is still two weeks away. So I'm looking for any ideas on how to deal with this.

I'm trying to be calm when taking it away but it is hard when he acts like a maniac next to a street with traffic (I'm mostly afraid that he could bite me and I would accidentally drop the leash and he could get hurt).

This is my first dog, I'm trying my very best but sometimes I just feel like I'm doing it all wrong. If anyone got any advice on how to handle this please let me know, I'd really appreciate it.