I went thru something exactly like that.. me and my hubby went to pick them up at the vet by train, and we have a pet stroller so we put my boy and girl in and he was arched and just humping air..lol... then he started mounting her.. it was so embarresing.. we where onthe train, he was going at it. i wanted to die, we put a baby blanket over the opeing so people couoldnt see what was happening. and i couldnt seperate them because you have to keep pet in a cage while on the train. So i had to rock the stroller back and forth so nobody would notice. and once we got home he would be standing and humping air, it eventually went away about a week later, and happens when he sees that she get all rild up when barking at strangers..
