A group of pugs is called a grumble.

Pugs are brachycephalic dogs. This means they have short, broad skulls and flat faces. This physical shape creates a shortened airway and a long soft palate. When pugs breathe or get excited, these parts of the throat vibrate to create grunting sounds.Pugs were first bred in China during the Han Dynasty around 206 BCE. They were companions for royalty and lived in palaces. In the 1500s, Dutch traders brought them to Europe. They became the official dog of the House of Orange in the Netherlands.Pugs are very social and prefer to stay in groups. Their vocalizations are different from the sharp barks of other breeds. They use low-pitched mutterings to communicate with each other and humans. Veterinarians listen to these sounds to check if a pug is healthy. If the grumbling sounds too strained, it can mean the dog is having trouble breathing.