Around chapters 17-23 there is a small arc involving villains who mistreat dogs. Ultimately, no dogs are killed, the villains get karma and I would say the author seems compassionate towards making sure all doggos end up being ok in the end.
in chapter 20, a woman kicks a man in the face and we see his teeth damaged and flying out. also in chapter 52, a woman sticks a baton into a man's mouth, visibly breaking his front teeth.