We generally put the dogs in the back. With this we've been able to comfortably travel with Fudge, Scamp and Taz (although Scamp usually jusmps into the back seat and lays on someone's lap). If I was taking Tika as well as the three boys I would probably put Tika and Taz in the back, Fudge on the back seat and Scamp in someone's lap. They probably could all fit in the back but they all like their space and there's no reason to risk a fight. They all travel well (bar Tika) though. If they behaved badly in the car I would maybe use a crate but then it woud just be one dog at a time.