wabigoon;
Hopefully besides the current quandary of why we can't eat polar bear liver that this finds you and yours well.

For the record, we shouldn't eat the liver of seals or husky dogs either and for the same reason.

Here is the best/shortest explanation I could find.

http://science.howstuffworks.com/environmental/life/zoology/mammals/eat-polar-bear-liver.htm

All the best to you and yours sir - and may neither of us ever be in a position where we are consuming our sled dogs to survive.

Regards,
Dwayne

The most important stuff in life isn't "stuff"