@dogfacts

Male dogs have a bone in their penis.

As an extra, here's a cool little doggo.

Dogs have a unique way of showing affection, called a "butt wag," where they wag their tail and wiggle their rear end.

As an extra, here's a cool little doggo.

Dogs have a special gland on their feet that releases a scent when they mark their territory.

As an extra, here's a cool little doggo.

One unspayed female dog, her mate and their puppies can produce 67,000 puppies in six years.

As an extra, here's a cool little doggo.

This pup, Nesbit, earned over one million Delta airline miles in his life and had his own frequent flier card.

As an extra, here's a cool little doggo.

Female wolves have been known to travel great distances to regurgitate full meals for their hungry pups.

As an extra, here's a cool little doggo.

Wolves and dogs can mate to produce fertile offspring.

As an extra, here's a cool little doggo.

A dog's nose is so sensitive that they can detect minute changes in the earth's magnetic field.

As an extra, here's a cool little doggo.

The Saint Bernard gains its name from the "Great St. Bernard Hospice;" the monastery where Barry and other mountain dogs was raised by monks to rescue victims from the snowy Alps.

As an extra, here's a cool little doggo.

Like human babies, Chihuahuas are born with a soft spot in their skull which closes with age.

As an extra, here's a cool little doggo.

Dogs aren't colorblind but their eyes don't have receptors for red. They see in shades of black and white and also in shades of blue and yellow.

As an extra, here's a cool little doggo.

Dogs do not have an appendix.

As an extra, here's a cool little doggo.

Dogs have twice as many muscles to move their ears as people.

As an extra, here's a cool little doggo.

Humans generally see better than dogs, but dogs see much better when there is low-light.

As an extra, here's a cool little doggo.

The Basenji is the only barkless dog.

As an extra, here's a cool little doggo.