
I do alot of work in my garage. I’d like to be able to let my dogs in the garage with me but since I open the door to let the air flow through, they always wander out the garage and into the street. My garage is impossible to be in without opening the door because of the heat so I want to come up with some type of barricade that will close off the bottom 3 or 4 feet of the garage. Kinda like a baby-gate except that my garage door is 16 feet wide. The first thing that comes to mind is using 2 panels of plastic latice framed in some manner that they can be attached to each other then attached to the garage door frame. This presents a storage problem though since these things have to be moved all the time to let the car in and out. Does anyone have any ideas?

You’ve already given yourself 10 points for a best answer. That is exactly what I’ve done twice.
Without knowing the substance of the door, IE: sectioned steel/fiberglass/wood, I’ll assume it opens "UP"
You can frame the lattice with 1×2 treated lumber OR use the Channels sold specific to PVC Lattice. Use piano hinges at the top, allowing that the panels can fold up and attach in your choice of methods, to the interior face of the door,,,Spring clips, etc. To close the door, swing the lattice panels up and clip to the door,,, then reverse to lower the door.
If you have an auto garage door opener, you’ll have to work around that challenge, and if it has sensors for safety, you may have to disengage them temporarily when lowering the door to the base frame of the lattice. Lattice is sold in 4×8 and 2×8 sections at HD or Lowes.
Steven Wolf