Built to Sniff, Built to Cool: teacher key

Dogs, grade 5 edition, written for 5th grade. How do a dog's nose, ears and eyes work, and how did dogs come to live with us? Learn what scientists know and what they argue about.

Read the book. Print this page for the key.

Questions and answers

1. What do dogs mostly do to cool off?
   • Sweat through their skin
   • Pant (answer)
   • Sit in the shade only
2. How many smell receptors does a dog's nose have?
   • About 6 million
   • About 40 thousand
   • More than 100 million (answer)
3. Which colors do dogs see well?
   • Blues and yellows (answer)
   • Reds and greens
   • Only black and white
4. What did Chaser the border collie learn?
   • How to read
   • How to open doors
   • The names of more than 1,000 objects (answer)
5. A dog's brain gives a lot of room to smells. What does that suggest?
   • Dogs cannot hear
   • Smell matters a great deal to dogs (answer)
   • Dogs sleep little
6. Why should you give a friendly family dog space?
   • It can snap if it is startled (answer)
   • It cannot see
   • It is always asleep

Words

• canids: dog family
• receptors: smell sensors
• cones: color cells
• hertz: a sound unit