How Do I Know If My Dog Is Happy? 7 Signs of a Happy Dog

Happy facial expression

A relaxed, open mouth with a lolling tongue can indicate dog happiness. According to Bekoff, happy dogs have loose jaws and may look like they’re smiling with the corners of their mouth turned up. A happy dog may also show their teeth when their mouth is open and relaxed, but not in a way that indicates aggression (bared teeth, lips curled back).