There may be many reasons why dogs like to enter other people's cages, such as curiosity. Dogs may be curious about other dogs or toys in the cage and want to explore them. Sociability: Dogs are social animals and they love to interact with other dogs. If other dogs are in the crate, they may try to get in and play with other dogs.
Dogs may feel safer and more comfortable in a cage, so they may try to enter other people’s cages to gain Similar feeling. Whatever the reason, it's not necessarily a bad thing for your dog to get into someone else's crate, but you need to make sure they don't disturb other dogs or cause other problems when they go in. Before letting your dog enter the crate, you should observe the surroundings and make sure this is a safe and appropriate behavior.