One character is believed to have accidentally poisoned a dog by mixing slug pellets into his food instead of dry kibble. There is no overt, intentional abuse
There are a few gross scenes where drowned/decaying bodies are described, and a scene where someone is attacked with an axe. It's never described in excess
The protagonist is punched by a person in a wheelchair, and later begrudges (in internal monologue) anyone finding out that he lost a fight to a man in a wheelchair. A character's arm is injured, and another person comments that at least he'll be able to get handicapped parking from now on