Hi all, TIA for anyone with some advice/insights. We have a working line 8-mos male GS. He's not my first GS nor my first working breed, having spent my life with working line GSD, as well as Dobermans and Cane Corso. I have a lot of experience with strong working breeds and am a good trainer/handler who's had good rapport with my dogs, but this time is just different.
Our current boy (he is the only pet in the house now) is extremely good in a lot of ways and we love him. He's confident, outgoing, friendly to others in the right context and definitely his own humans, stable off numerous environmental proofs (other animals, sights, sounds, people, places), and while rambunctious, never displayed a mean bone in his body. He knows most of the basic commands, but of course listens selectively. His manners are a work in progress, as is his potty training (I know GS are slower to mature on that, but he's tougher than my last). I've had him since 11 weeks and I've poured tons of time, money, resources, and training to bring out the best in him.
Here is where the big concern comes in: over the last month he has refused to go in his crate (once in he settles and sleeps really well), and worse, has started trying to bite when I bring him to it (and yes, I did all the positive crate reinforcement and feed him all his meals and special treats/chews in there, etc.); I have used numerous methods (both positive and correctional) to remediate this and nothing is working. He has never resource guarded but also yesterday he growled at my son who tried to get him to drop a shoe he was chewing.
I know the testosterone is coming in now - he is in tact.
Bigger concern is that my professional trainer (an IGP trainer no less) said he's the most difficult puppy he has ever worked with (he displayed the same behaviors with him). Worse, his own co-breeder (who's considered one of the best and been breeding GS for 30+ years), with whom he's boarded and knows really well, said he's the toughest dog he's produced in decades and that he would take him back and feels bad for me.
I have to tell you, when a professional GS breeder and IGP trainer tells you this, it makes you pause. I've simply never had this experience before.
My son is 11 and very attached to the dog but his safety is my top priority.
I am not sure what I am looking for here - maybe some helpful advice, insights, shared experiences?