Three can be a handful at times - when I had three at once, I decided 3 was too many for me.

I NEVER roll the car windows down far enough for them to get through, never ever. My last car had an automatic window button on the arm of the door... I looked over once and saw Rosie standing on it with her head out the window & and the window was going all the way down! I turned it off.

Also, I use a leash to get them to the car, even if it's a short way. Don't know about labs, but with huskies, you can never be too careful. They're gone in a flash, and they think it's a great game to stay one step out of your reach.

You may want to try these two things for your next trip, and see if it doesn't go a easier on you. The dogs won't be all nervous from getting yelled at either.