Call Animal Control.

Absolutely call the police. It's despicable.

Also you can call:

Officer Stephani Johnson, Municipal Animal Control Officer for the City of New Haven
81 Fournier Street
New Haven, CT 06511
(203) 946-8110
sjohnson@newhavenct.net

Here's a good article too:
http://www.peta.org/issues/companion-animal-issues/companion-animals-factsheets/spot-animal-abuse/

We are closing this request due to its historic nature. If this concern still requires attention and you still believe SeeClickFix is a viable tool for its resolution the best way for it to be addressed is for you to create a new request including a current description of what is occurring and what solution you hope to see regarding this matter, citing/linking this request in the details. Thank you for your dedication to improving the quality of life in our community.