When Chance sees Sassy on a seesaw, he jumps on the other end--sending her flying (but landing safely on all-fours, unharmed). Later, Chance does the same to a mountain lion.
Chance fights viciously when the animals see they've been taking to an animal shelter. Shadow is muzzled and dragged back into a cage.
We see Chance opening his mouth to vomit after eating Bob and Laura's wedding cake. The content is only seen briefly from a short distance.
Chance gets knocked in the face by a porcupine. He has quills sticking out of his face, not very graphic.
While at a pound, Chance is taken into a room so the doctors can remove some porcupine quills from his muzzle. Chance makes certain confessions through the scene, such as "I stole underwear on three occasions", then after a quill is removed, "All right, four!" While looking into the room, Shadow tells Sassy that they're killing him. It is put together in a way to show this is not true, but this may still seem intense or scary to young viewers.
Shadow is gravely injured in a fall behind a coal cart at a railyard, but survives.
Sassy is swept away in a current, apparently drowned in the river after falling from a waterfall. Chance and Shadow are grief-struck by this, until it turns out that Sassy was rescued by a hermit.
A dog tells a turkey that he'd like to "chew on his neck a bit".
The pound is compared to prison in a way that might be confusing and slightly frightening to younger viewers.
A dog tells its friends that a moose is a "large razor-toothed animal that eats the tails off of smaller animals". This scene takes place at night and is rather eerie.
A mother bear towers over a dog in a sinister way.
A puma chases two dogs, but they outsmart it.
A cat is nearly squashed flat under a moving train, but it squeezes out.