1. Comparative Anatomy of a Dog and a Rabbit

2. Commonalities of All Mammals  Have mammary glands  Have a single lower jaw  Have hair  Are endotherms  Have a diaphragm  Have a four-chambered heart

3. Dog Characteristics

4. Smell  Excellent sense of smell. Helps them to sense prey

5. Eyes  Eyes in Front of Head  Allows for depth perception

6. Whiskers  Sensitive whiskers  Whiskers work with air currents to pinpoint where prey might be  Touching whiskers closes the dog’s eye for protection

7. Eyelids  Nictitating membrane  acts as third eyelid

8. Feet  Walk on toes at 90° angle  Paw pads for protection

9. Maintaining Body Temperature  Main cooling is from panting

10. Teeth  42 teeth in adult  There are four types of teeth.  Incisors are the primary biting teeth.  The canine teeth bite and tear food.  The premolars shear, grind and mash food.  Molars are responsible for the most rigorous chewing.

11. Reproduction  Gestation period is 63 days  Only goes into heat (estrus) twice a year so can get pregnant only twice a year  Has an average of 6-8 babies at a time depending on breed

12. Rabbit Characteristics

13. Smell  Excellent sense of smell. Helps them to sense predators

14. Eyes  Eyes on sides of head  Allows for two fields of vision – looking for predators and escape route simultaneously  Poor depth perception

15. Whiskers  Sensitive whiskers

16. Eyelids  Nictitating membrane  acts as third eyelid

17. Feet  Flat-footed with no foot pads  Use claws for traction

18. Maintaining Body Temperature  Large ears for temperature control and hearing

19. Teeth  Two pairs of incisors in upper jaw. One smaller pair behind the larger pair  28 teeth that grow continuously  They have molars and premolars too!

20. Reproduction  Gestation period is 31 days  Does not go into heat (estrus) so can get pregnant at any time  Has an average of 6-8 babies at a time depending on breed