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I put my 70 lb boxer in the back with the 2nd row up all the time and she loves it, though as Mentalspaz says, she cant do a ton of turning around, so she usually just sleeps. Be sure to pre-cool the car if you're in a hot area as the airflow to the far back isn't the best. Better to get it down to 70 and then even on an hour trip it stays comfortable.