What is a dog head?

A dog's head is a shot of a person's head as a dog's head, indicating a bad image. However, up to now, as long as it is not a mirror of a famous manufacturer, it has been called a dog's head by boasters. Even if the person named Dog Head has never used it or even seen it himself (or he only has a stupid camera of a dog and has never touched the dog head), as long as he reads it online or buys a magazine, he can be upgraded to a mirror critic, criticizing that many shots are dog heads. Anyway, I

I have hundreds of shots, but the most proud photo I took was taken with sigma 28- 105, which is recognized as the standard dog head by these experts.