Well, first off, women are humans. Pretty much everyone agrees a humans life is more important than an animal. Also, unless there are women being forced to fight against each other AGAINST their will until death then it is much different.
I admittedly dont know much about chicken fighting, which is why I thought it was the closest comparison you made, because it is animals being forced to fight each other against their will. However, dogs are looked at differently than chickens by most people. Now, thats not a fact, but youll be hard pressed to prove to me that chickens are looked at the same way as dogs are.
Now, Im not a hunter but as long as its legal, its different. Same with bull fighting, which isnt the same circumstance anyway.
Either way, what Vick did was bad enough to earn time in a federal prison. Nobody, including Pacman or Chris Henry came anywhere close to that. If you have a problem with the laws and/or punishment thats a different issue.