PETA, the nation's largest animal advocate group responded to Michael Vick's dogfighting plea agreement by asking the NFL to take strong action against animal abuse in the future.
PETA is calling on animal lovers to help wage a personalized letter writing campaign via the following statement:

NFL quarterback Michael Vick has pleaded guilty to federal conspiracy charges involving illegal dog fighting. This is the latest in a long line of animal abuse cases involving NFL players. While the speed and efficiency with which prosecutors handled this case is a victory for animals and a sign that the crime of dog fighting is being treated with the gravity that it deserves, the NFL needs to follow suit.

PETA is again calling on the NFL to add cruelty to animals-in all its forms-to its personal conduct policy. This case has clearly shown that NFL fans are just as outraged by cruelty to animals as they are by any of the other antisocial behaviors outlined in the policy.

As these recent examples show, the high incidence of animal abuse cases in the NFL indicates a disturbing trend that needs to be addressed immediately:
Earlier this year, Vick's teammate Jonathan Babineaux was accused of inflicting blunt force trauma on his girlfriend's dog, Kilo, following an argument. Kilo died after reaching the emergency vet clinic.
In 2004, NFL running back LeShon Johnson was found guilty for his involvement in a massive dog fighting ring.
In 2001, former Eagles running back Thomas Hamner was twice charged with beating his dog and has been convicted of animal cruelty.
Furthermore, an informant from inside the dogfighting world who spoke on ESPN's Outside the Lines told reporters about "a whole roster of names of professional athletes that we know are involved in dogfighting... I bet not even 10 percent have come to light." Given these disturbing allegations and the numerous recent cases of animal abuse involving NFL players, the NFL needs to act vigorously and with authority to stamp this out immediately. A form is available at Peta.com that can be used to ask the NFL to take strong action against animal abuse in the future by updating its personal conduct policy.