Wire Crate-I recommend a wire crate with a divider that will grow with your puppy. Goldendoodles are thick coated dogs and get hot in the plastic closed in crates. You don’t want the space to be too large while your still potty training. The 36” is a good size for mini-medium goldendoodles. For standard size the 42" would be a good size. Their crate not only helps them learn bladder control since their their natural instinct is to keep their bed area clean, but it also becomes their safe space.