Page 15 - Dog

Brain case Huge DOGS’ ANCESTOR
(cranium) Large orbit for eye head Wolves (pp. 22–23)
Upper jaw have typical long
heads and
muzzles.
Ear bone

Canine tooth
Side view of skull
of Japanese chin
Lower jaw

A JAPANESE CHIN
All dogs are descended
from wolves, even this
Japanese chin, or
spaniel, with its little
round head and
short curved jaws.
Orbit for eye

Upper molar
Canine
tooth

Arctic wolf

Incisor
Powerful
Hard palate nose
Ear bone
Palatal view
Zygomatic arch, or (showing roof of DOG SLEUTH
bony arch at outside mouth) of skull The bloodhound has a
edge of eye socket of Japanese chin straight head, but not a
pronounced muzzle; it uses
its powerful sense of smell
for tracking (pp. 16–17).
Palatal view
of bat-eared fox
Small molar for
eating insects Bloodhound
Straight
profile
DIFFERENT TEETH
The bat-eared fox has to head
teeth that are different from
any other canid (they are Incisor
smaller, and there are 4 to 8 more than
the usual 42) but its head is still doglike. Hard palate Fox terrier
Brain case STRAIGHT-LACED
(cranium) Zygomatic arch The fox terrier (pp. 52–53)
of eye socket has been bred to have a
Nasal very straight head,
region with no angle between
Ear the brain case and the face.
bone Pekingese
Flat face
Incisor
PERKY PEKE
Canine Years of selective
tooth breeding (pp. 58–59)
have given the Pekingese
Side view of skull Lower jaw a small, round head, flat face,
of bat-eared fox floppy ears, and soft fur.

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