might be right, never had deerhoundxs , but all dogs are differnt to each other, they all got there own temps, even if same breed or in this case same kind of x. It like saying all bullxs are going to have same amount of tenacity, there not like any dog each one is differnt. My pup 1x gsdx grey dont like the car, he wont keep still in the back, and he would winge in the back or bite Bryn lol. He is bit better but not alot, now is litter mates from what ive been told travel ok,same as is sister is very full on he is bit sensitve same litter but all differnt .So its each dog not a breed or ty