Should have gotten the 4 seater. I have a problem with my fox terrier. He likes to get on my lap while driving and he is 34 lbs, and doesn't really fit between the steering wheel and my tummy. He does like to open the sliding windows on his own. Whippets are very slight, and you shouldn't have a problem putting them on your passenger's lap. You could do what Romney did on a summer vacation. Put the whippet in a carrier and fasten it to your luggage rack.