Rowlf the Dog
Rowlf the Dog is a puppet dog.  He is one of the Muppets created by Jim Henson.  He has been in many of the Muppet television shows and movies.  For example, Rowlf was is in The Muppet Show (1976-81), The Muppet Movie, The Muppets Take Manhattan (1984), Muppet Treasure Island (1996), The Muppets (2011), Muppets Most Wanted (2014) and both the old and new versions of the Muppet Babies television show.