I guess a concern that I have is that I don't know what's high value for him. The things he guarded were not newly introduced things. We'd played fetch multiple times this week with the toys he guarded and he'd happily dropped them when asked. The treat (a dentastix) is something he's been getting since almost day one, again never with any sort of guarding behavior prior to Thursday. I think that's where some of our anxiety comes in because we just don't know what he's going to react to or when he will react to it. The unpredictability of the entire thing is honestly scary and one of the big concerns I have with having people or children over. What if he decided to guard something he's never guarded before, just like these items. We have been practicing drop it, leave it and trading up since since he came home a month ago, yet still this is happening and seems like it might be extending into other things. Today when I gave him a piece of kibble for coming over to me in the house when called (kibble is his low value reinforcer treat), instead of eating it there like he usually does, he took it and then walked back across the room to his bed to eat it, which I know is a lower grade show of resource guarding.
My vet is the president of the adoption group we went through and his wife, the adoption coordinator, is the one who gave the Barkbusters recommendation, so I doubt he'd have anything different to give me. I've been doing some research of my own into trainers in our area, but honestly I just feel so overwhelmed and upset by this whole situation and there's just this constant voice in the back of my head that just keeps saying "What if we're not the right home for him?"