Can a dog know how old another dog is?

Answer 1

No. It can tell whether its a puppy or adult, but not the accurate age. But if your dog is old, it can tell another is a puppy because it normally bounces around happily and playfully while the old dog growls in frustration because it has lost it's hobbies/personality of playfulness.

Answer 2

Dogs do, in fact, remember one another. It comes from their sense of smell. When one dog smells a familiar dog, it will become excited. This is apparent when walking a dog in a familiar neighborhood or in a case where a dog owner has multiple dogs that interact. They either like one another and feel secure, or hate one another and are hostile toward each other. Either way, it goes back to their sense of smell, which, as in humans, is the most closely connected sense to the memory part of the brain.

Answer 3

Dogs can't determine each other's exact age, but they can make rough estimates based on physical cues like energy levels, gray hair, and overall health. Social cues and interactions also play a role in how dogs perceive each other's age.