Dogfighting is a situation in which one dog attacks or fights another dog. Dogfighting is also a blood sport where dogs that have been bred, conditioned, and trained to fight are placed in a pit to fight each other for spectator entertainment and profit. Dogfighting—as defined in state and federal statutes—is a felony criminal offense in all states and under federal law.

The definitions and penalties or punishments for dogfighting vary from state to state but usually provide that a person commits an offense if the person intentionally or knowingly:

(1) causes a dog to fight with another dog;

(2) participates in the earnings of or operates a facility used for dogfighting;

(3) uses or permits another to use any real estate, building, room, tent, arena, or other property for dogfighting;

(4) owns or possesses dogfighting equipment with the intent that the equipment be used to train a dog for dogfighting or in furtherance of dogfighting;

(5) owns or trains a dog with the intent that the dog be used in an exhibition of dogfighting; or

(6) attends as a spectator an exhibition of dogfighting.

The criminal offense for dogfighting is sometimes included in state statutes that make it illegal to cause various kinds of animals to fight (dogs, bulls, cocks, etc.). Dogfighting is also illegal under the federal Animal Welfare Act (statute) that prohibits “animal fighting ventures” and is located in the United States Code at 7 U.S.C. §2156.

In Washington State, dogfighting is strictly prohibited and is considered a felony offense under RCW 16.52.117. The law in Washington mirrors the general prohibitions found in other states and federal statutes, making it illegal to (1) cause a dog to fight with another dog, (2) profit from or operate a dogfighting facility, (3) use or allow the use of property for dogfighting, (4) possess dogfighting paraphernalia with the intent to engage in dogfighting activities, (5) own or train a dog with the intention of using it for dogfighting, and (6) attend dogfights as a spectator. Penalties for engaging in dogfighting activities can include significant fines and imprisonment. Additionally, under federal law, specifically the Animal Welfare Act (7 U.S.C. §2156), dogfighting is categorized as an 'animal fighting venture' and is illegal, with enforcement carried out by federal authorities. Violations of the federal statute can lead to severe federal charges, fines, and imprisonment.