YES. The dog is only briefly mentioned, but it gets attacked by the polar bear. It's suffering is descriptive, and it has to be mercy-killed by a gunshot to the head. It's further into the book
They are on a whaling ship, and there are graphic depictions of whales getting harpoon, seals being skinned, and a polar bear being violently separated from its mother where it is then abused by the crewmates.
Two children are assaulted. Early in the book, one is graphically assaulted, and in the middle another assault happens off-page, but it is explained and the aftermath is also obvious.