A dog's grin is just a normal activity of facial muscles, and it does not necessarily mean that the dog is smiling because he is happy. Nowadays, many dog ​​breeds will smile. This smile is just an expression that belongs to human cognition. It is not certain whether the dog is really in a funny mood. But one thing is certain, the dog making this expression was not in pain at the time.

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In addition to smiling expressions, dogs can also express many other expressions, such as depression, sadness, and crying. They may not necessarily express the dog's true emotions, but when parents find that their dogs have these expressions, it is best to observe the dog's physical condition, because healthy dogs generally do not express these expressions.