"True Blood" Second Season Premiere
There is substantial transformation content, because one of the main characters is a weredog of sorts (technically, he is called a "shifter" and can transform into any animal, but in practice it is basically always a dog). Furthermore, if the TV series follows the second novel at all faithfully, there will be other shapeshifters as well, including werewolves.
If you haven't seen the TV series or read the books, what should you start with? I think both are good, but they have different characteristics. The novels are more "fluffy" like a beach read, and have simpler plot lines. The TV show is much darker in tone (there is quite a lot of gore, including some really gross sex scenes) and has more subplots and character development. I think the TV series has a richer storyline, particularly since the novels are very first-person but the TV series is willing to show us a lot more of what other characters were doing when the main character isn't around.