It's a dog cage. My daughter has a larger version, for a larger dog, that she calls a "gorrilla cage".
Since no one responded to they question, I'll speculate: Notice that the door is open. Logan probably crawled in there on his own, to visit the dog, who promptly, or not so promptly got outa dodge.
I remember crawling into and even riding in our Spring Spaniel's (Lady of course) travel cage in the trunk of our '53 Pontiac. (It had ventilation louvers over what should have been the rear speaker holes). That travel cage, homemade, still exits, AFAIK, but has long since been converted into a cage for keeping baby chickens in, complete with warming light. It's idle now, as the Chicken Man, my father, passed away in April of 2004. (He really was known around our city and state as The Chicken Man.)
Thank you, sweetie, but I'm sure Nana realizes I was joking. He is a smart, curious child, and he explores everything in sight.