Well I've been hearing this go around the blogging community and I'm not sure as to what is 100% true or not. But apparently creation or use of any Dr. Seuss related clip art is illegal and now Scrappin' Doodles is being sued because of it. To get some more information about this topic, I would recommend reading a post by the 3AM Teacher.
I am really sorry to anyone who bought it. I had no idea that this would be any sort of issue with the Dr. Seuss franchise. I would just recommend to be careful with how you use it. I think it is considered "illegal" to claim it as "Dr. Seuss" related. So when making any activities or printables in the future, do not associate your OR my work with Dr. Seuss or any of it's characters.