I was a first-time dog owner when I got Cody and she was a 'difficult' dog... separation anxiety, wanted to eat my cat, etc. My group wouldn't take her back!! (And of course I'd bonded with her anyway) So people of GT, don't assume that all groups are great & work with you - this same group refused to take a friend's grey back - told them she'd have to put the dog down if they returned him!! Eventually, after trying everything, as a last resort, they did return him & she found him a great home with someone home all day. So... 1 & 1/2 years of torment for them AND the dog because of the group owner....
Hope training goes well tonight!! Sometimes, something just clicks in their grey-brains & they realize they're home & can trust....
Hugs!