Pic for the inquiry on if two can fit. It has 2 harness clips. One on each side. Also a latch in middle. This is Lexie and Chance both in it, and that's with blankets stuffed all in the bottom. Lexie wouldn't sit down, she wanted to stand up in it, and used Chance's head as a step stool.

So yes, two can easily fit, 3 even.