Anyone know of a good morphing tool?

I want to morph two pictures together but don't know the best way. Maybe it is just a photoshop thing I should try. Basically I want to morph a picture of a dog head with a picture of a pig head, but I haven't found any good pics of either to use yet. I need it to have the pigs eyes and not many shots I have found show them very well.

Any suggestions would be greatly appreciated.