Two men have pleaded not guilty in Massachusetts in the deaths of four dogs, including one whose ears were cropped with scissors and another who was fed Valium inside pieces of meat.

Jason Gentry entered his plea Friday in Salem Superior Court. He has addresses in Salem and Swampscott. Long Beach, New York, resident Dominick Donovan pleaded not guilty Thursday.

Both are charged with animal cruelty.

The Salem News reports (http://bit.ly/1JP0Rxv ) they were arrested last summer after two dead puppies were found in a trash bag. Authorities allege Donovan hanged the puppies from their collars until they asphyxiated.

Officials say three of the dogs died at an unlicensed kennel run by Gentry.

Gentry has agreed to be a witness in the case.

Donovan's attorney calls his client a "respected breeder."

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Information from: The Salem (Mass.) News, http://www.salemnews.com