Well, I went back to the store and thought the Danforth was too bulky
and sharp so I bought a 10lb Navy type anchor. It got the flukes, but
not the bulk.

http://www.basspro.com/servlet/catal...=SearchResults

Would I need a chain for it???

One situation I may encounter where I need a strong anchor is when I'm
facing a strong wind and the waves flood the boat too much, so I throw
anchor, bail out, and keep on going. This happens quite often in winter
time when I'm returning home. We are two people and one can't keep the
canoe straight into the wind.