Update: Verizon did the right thing and pulled the ads:

You signed the petition, Make Verizon Accountable. Can They Hear Us Now?, on Jul 21, 2008. The petition received 5083 signatures. The petition author, R. Brace and the ASPCA online community, has now closed the petition and posted the results:

Message from the petition author, R. Brace and the ASPCA online community:

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I have just spoken with Steve Schwartzman, Executive Coordinator, who told me that the offensive ad has been pulled in all markets. Thank you to all who signed this petition and made the calls! Mr. Schwartzman was very understanding of our feelings, and admitted that they have received quite a bit of heat over this commercial.
Each and every one of you made the difference.

Thank you again.

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Pit bulls are good dogs and make very poor guard dogs because they love people so much. There is a petition here.