I can't believe I'm actually defending him, but it's not like he's Michael Vick here. As other people have pointed out, this is not an uncommon practice. I would never do it if I owned a dog, but on a scale of 10 of douchey things to do to animals, this is like a 3 or 4.
For all the people up in arms over this, if you have boys and you got them circumcised, burn yourselves with acid immediately for your pathetic hypocrisy.