[nikynoo]

hi
i have a female yorkie who is nearly 7 years old,
my sister has a male jack russell who is just over a year old...we wanted the dogs to spend time together and go walking together which we have been doing they get on fine but...the male jack russell has turned into a complete sex crazed lunatic when my yorkie is around.he is acting the way my male would act when my female comes into season-ive never seen a dog like it!..we took them on a walk today and he was the worst he has ever been he walks with his nose permantly stuck to her rear!!(when he will walk) wont walk has to be dragged barks and lunges at everyone who comes by basicly he is the complete opposite to what he usually is...so my question is...is this normal behaviour??..why is he doing it?? and what do we do!!....why is he doing it so bad and she isnt even in season!!!...............thanks