The last four episodes have very severe gore, as dogs get crushed by bears and overall fight together quite intense.
Lots of animal violence occur throughout this anime. Blood is often shown.
Several people and dogs get attacked and killed by various bear attacks. People use weapons to kill animals.
A man chops off one of his legs. The impact isn't directly shown, but we see the act.
A man gives a puppy hard training, beginning with beating it up.
A boy falls into a deep hole, and gets saved by a puppy.
Later episodes have dogs often fighting each other. Several dogs get killed. In various other scenes throughout, dogs kill a few other kind of animals.
Some other animals, including birds and a few boars to name a few, get hunted down and killed, mostly for food.
The final battle is intense: lots of animals get killed, and the battle itself has the most blood overall.