Whenever I try to reward my 10 week old puppy, I give her a dog biscuit, Bacon-flavored cookie, or a Mars Mix treat. However, she just sniffs it and then turns away.
Why doesn't my puppy like her treats?

(She likes her puppy chow just fine and I know her teeth can chew them.)
Should I try to find a treat she likes, or just reward her with praise instead?