Mass. Gen. Laws ch. 272 § 94
Whoever: (i) owns, possesses, keeps or trains any bird, dog or other animal, with the intent that it shall be engaged in an exhibition of fighting; (ii) establishes or promotes an exhibition of the fighting of any birds, dogs or other animals; (iii) loans, sells, exports or otherwise transfers any bird, dog or other animal for the purpose of animal fighting; or (iv) owns, possesses or keeps any bird, dog or other animal for the purpose of breeding such animal with the intent that its offspring be used for animal fighting shall be punished by imprisonment in the state prison for not more than 5 years or in the house of correction for not more than 1 year, or by a fine of not more than $1,000 or by both such fine and imprisonment.
Mass. Gen. Laws ch. 272, § 94