In Balto 3, Wings of Change, when Boris needed help with his problem with Stella, Balto said:
"I'd give my eye teeth to fly just once! Why don't you?"
I even put it on subtitle, and it said that.
What did Balto mean by "Eye Teeth"?
"Eye teeth" is a colloquial or secondary term for the canine teeth present in mammals (including us)...the ones which are so pronounced in dogs and other canids.
Thus implying he'd be willing to make a heck of a sacrifice just to fly...even just once.