The phrase "happy dog" means a dog that is feeling joyful, content, and satisfied. It refers to a dog that is in a positive state of mind and experiencing happiness. Full definition
They went to homes that wanted them, were willing to pay an adoption fee and are now sending us photos of happy dogs in happy homes. (okcpetsmagazine.com)
Together we can be our dog's advocate as their voice and create a world of happy dogs in happy families. (dogdecoder.com)
She's sweet, affectionate and an all around happy dog who is always happy to see you. (rehomeyourpets.com)