I have read some things about evaluating temperments of your pup before you buy him/her,but are you suposed to do it one by one at the breeders house?i mean like one of the tests are to hold the pup on its back for 30 seconds,are you suposed to that at the breeders house,or when?i asuming thats when you have to do it,not after you have bought the puppy,but wouldn't some breeders be thinking 'what the hell his he doing?'