My only experience with Doctor Dolittle is bits and pieces of the Rex Harrison movie. Talk to the Animals and all that.
Since the book was free (thanks Amazon) and it's a short one, I decided to read it. A 30 min workout and two subway rides was all it took. A children's book, clearly, but still a fun one to read (albeit one with a very 1920's view on black people... it wasn't Song of the South, but wow, it certainly isn't politically correct).
I also had no idea there were 9 Doctor Dolittle books (and a few more that were published posthumously).
I'll probably check them out at some point, but I think I want to see what Oz holds next.