http://www.hsus.org/acf/cruelty/
http://www.pet-abuse.com/pages/animal_cruelty.php
you can check the state laws on animal cruelty. i know this is the fedral law.To fail to provide an animal with:

Proper food and water
Shelter or protection from the weather
Veterinary attention to reduce or end suffering from disease or injury
A sanitary environment
To willfully abandon an animal
To carry or cause an animal to be carried in or on a vehicle in a manner that endangers the animal including transport of an improperly secured animal

To willfully permit an animal to be subjected to unnecessary torture, suffering or cruelty

To Subject, Cause or Procure an animal:

To be tortured or tormented
To be cruelly killed, beaten or mutilated
To fail to notify the owner or police after striking a dog or cat with a motor vehicle

To use animals as lure or bail in a cruel or inhuman manner

To transport an animal in the back of a motor vehicle unless animal is properly restrained

In November, 2004, animal cruelty, as defined in Massachusetts General Laws, Chapter 272, Section 77, became a felony. Until November 17th, animal cruelty had been considered a misdemeanor. Now, violations of this law may result in a sentence of up to 5 years in state prison, or up to 2.5 years in a county jail and/or a fine of up to $2,500.