He sounds like a great dog to work. You wanted a lot of dog and you got it.
Sure I hope I have a half sister of his to play with this fall!
Sumo or Reza? I am assuming Sumo because I know you like him. I have not met Sumo; but I trusted Kathy's insight on him as a high drive extremely clear-headed dog.
I asked the MT about a growl when I had to correct Beau on a ball release if I should be concerned and he told me I should. We agreed I need to work even MORE to build respect and control.
He also worked with me on command voice vs correction voice. But then I asked him if he was rank or overly dominant or some such terms as we describe the dogs and he said "oh, Lord no! He is a normal teenager whose testosterone is starting to build and just seeing what he can get away with"......FWIW he has slowly, almost imperceptibly, been adding muscle the past few months.....
He would probably be a typical patrol dog but for someone like me who has mainly owned pet type dogs (well Grim is a high drive dog but handler-soft, too
handler soft because I can talk him into an indication or off of a source**, and Cyra was working lines but a small female) is more than I have handled in the past.
Because I was not testing as he was already certified, I got to watch all the other dogs work. This was only his second time ever on a large rubble pile at a quarry (he was run to check the aids before the test) and he was very comfortable with it (the first time at the test in October, he was a bit hesitant on going down but he got over it-)
A couple of the other dogs needed the handler to go up the pile with them.
BUT! [obedience] he pee'd in a test area and tried to dig up a hide and was on the edge of out of control. But he reassured me it is 3 steps forward, 2 back etc. on the obedience for a while....and, at the start of the rubble pile he took a crazy detour running through the huge puddle of water and biting the ice before he settled into work mode. Sigh. I threw balls a good 30 minutes before throwing beasty-boy in the truck and heading to the test site to take the edge off.
**in some regards though working a dog like Grim helped me refine not cueing the dog.