Define Lesser Dog Meaning

A dog from undertale you fight in snowdin,keep petting him will make his neck will go further into the sky!And further..And further..And further..And further..And further..And further..And further..And further..And further..And further..And further..And further..And further..And further..!Then it will go lower and lower..and lower..and lower..and lower..and lower..and lower..and lower..and lower..Lesser dog.