What is the name of the thing on a dog's head? - briefly
The name of the thing on a dog's head is called an "ear".
What is the name of the thing on a dog's head? - in detail
The prominent feature atop a dog's head, commonly referred to as its "ears," serves multiple vital functions. Canine ears are characterized by their mobility and acute hearing capabilities, enabling dogs to detect sounds that humans cannot perceive. These sensitive organs are essential for communication, both with other animals and with humans. Dogs use ear movements to express emotions, such as happiness, alertness, or submission. Furthermore, the unique structure of a dog's ears, which often vary in shape depending on the breed, contributes significantly to their overall appearance and is crucial for their ability to navigate their environment effectively.