More than likely, you’ve seen a dog smile. Whether in person or photos on the internet, some pups have a grin that goes from ear-to-ear. Here’s the deal. That’s not by happenstance. According to canine experts, this is something that a lot of dogs do as a way or mirroring their human’s behavior. Simply put, when they see their owners grin, they try to mimic them.

And if you need more proof that dogs actually smile, check out these 50 photos. You’ll see for yourself that this expression is very real and very intentional.