Where is your dog's "Sweet Spot"?

I know it is so funny,my dog is the funniest dog in the world cause he is so clumsy. So if u scratch on the right side of his tummy really fast his leg goes really fast but if 당신 go slowly he goes slowly too. It is the funiest thing in the world.
He's a black laberdoodle.

my dog shakes its leg if 당신 rub it on the head
but when 당신 rub it behind its right ear it wud tipp its head to the side and if 당신 did it on the left ear it wud roll over and be like a statue
WIERD

the couch