It's these two traits of a dog's head that make dogs look so different from each other.
What are head size and shape?
These things in a dog's nostrils allow it to detect minute odors.
What are nerve endings?

What is a dewclaw?
When a dog is afraid, the hair on these things stand up straight.
What are hackles (shoulder and back)?
It's the small indentation in a dog's forehead.
What is a stop?
This is how a dog sizes up its environment.
What is "sniffing"?
You may have to do this to your laughter when you hear this alternate name for a dog's knee.

What is a stifle?
Dogs have 13 pairs of these to protect their large chests.
This word for a dogs lips sounds like it should be on a bird.
What are flews?
Dogs' noses are 20 to 40 times more sensitive than these.
What are humans?
It may be another name for a dog's ear, but I wouldn't want to make a jacket out of it.

What is leather?
Most adult dogs have 42 of these permanent fixtures.
What are teeth?
The middle and inner ears that allow a dog to do this very well.
What is hearing?
The dog's nose is at the end of this thing, which some people like to nuzzle up to.
What is a muzzle?
It's another word for a dog's carpus.

What is a wrist?
Vocal folds, located in the neck, determine this.
What is a dog's bark, growl and whimper?
This point is on the back of a dog's skull. Of course, where else would you put it?
What is the occiput?
Just as no two humans have the same fingerprints, these are unique to every dog.
What is a nose print?
Unlike humans, who have ten of these, dogs have four of these on the ground per foot.

What are toes, or digits?
The haw or nicitating membrane helps to protect and clean these.
What are the eyes?