Endorsements from free agent quarterback Michael Vick, who served 21 months in prison for his involvement in a dogfighting ring, are still bad for business it seems.

On Monday, Vick tweeted an endorsement for the auction site QuiBids, which angered some of the company's users. QuiBids then withdrew the endorsement on Tuesday:

We would like to sincerely apologize for the endorsements posted on Michael Vick's Facebook and Twitter accounts yesterday.

As most employees here at QuiBids are dog owners, we want you to know we would never, ever condone animal abuse, and we're sorry that our recent actions did not reflect our values.

Please know that we've had Michael delete his post and have stopped all future campaigns with him. Additionally, we'll be making a contribution to the ASPCA to help the fight against animal cruelty.

We very much care about you and what you think and will take measures to ensure this doesn't happen again.

Vick signed with the Eagles in 2009 following his release from prison. Since coming to Philadelphia, the 33-year-old quarterback has partnered with the Humane Society to speak out against animal abuse.