Wire Crate
Semel recommends placing a wire crate within the pen, which you can cozy up with fluffy blankets and toys for comfort.
She adds that a metal crate gives owners the ability to see their pup and the option to add a cover if your dog is more at ease in a cave-like space.
When it comes to size she says, “when they’re full-grown they should be able to stand and turn around comfortably, so even if it’s a little big when they’re smaller, most crates come with a divider so you can set it up for them to stand and turn when they’re puppies.”