The lens of a dog's eyeball is relatively large and deformed like a horse's eyeball, so it is impossible to adjust the sense of distance. Twenty or thirty meters is approximately the limit.

Below are the funny high-definition pictures of animals and dogs that I compiled.

Appreciation of funny high-definition pictures of animals and dogs. Display of funny high-definition pictures of animals and dogs. Regarding the origin of dogs, it is generally understood that dogs originated from wolves, but there are different opinions surrounding the specific place and time of their origin.

The earliest evidence of dog fossils is a mandible fossil from Germany 14,000 years ago. This archaeological evidence supports that dogs originated in Southwest Asia or Europe. On the other hand, the osteological identification characteristics of dogs suggest that dogs may have originated from wolves.

This puts forward the theory of the East Asian origin of dogs.

In addition, different breeds of dogs are extremely diverse in morphology, which seems to favor the hypothesis that dogs originated from wolves in different geographical groups.

Archeology alone can hardly provide reliable clues about the origins of dogs.