Just like human fingerprints, each dog's nose has a unique pattern of ridges and creases. This makes their nose print a distinctive identifier.
While a wagging tail is often associated with happiness, dogs also use it to communicate other emotions. The position and speed of the wag can convey feelings.
Dogs have an incredible sense of hearing. They can detect sounds at frequencies as high as 65,000 Hz, while humans can only hear up to 20,000 Hz.
Dogs primarily regulate their body temperature through panting, but they also sweat through their paw pads. However, this is a minimal part of their cooling process.
Dogs were likely the first animals to be domesticated by humans. Archaeological evidence suggests a domestication process that began tens of thousands of years ago.
There are over 340 different dog breeds worldwide, recognized by various kennel clubs. These breeds vary significantly in size, appearance, and temperament.
A dog's sense of smell is incredibly powerful. Some breeds, like Bloodhounds, have noses with up to 300 million smell receptors, compared to about 5 million in humans.
Dogs experience REM (rapid eye movement) sleep just like humans, indicating they likely dream. You may notice their paws twitching or hear soft barks during this phase.
Dogs have an upper lid, a lower lid, and a nictitating membrane, also known as a "haw" or "third eyelid." This membrane helps protect the eye and keep it moist.
Puppies can start learning basic commands as early as 8 weeks old. The critical socialization period for puppies is between 3 and 14 weeks.