There is another breed of Hogglo Pygmy called Hogglo Pygmy Black. It is a L41 mob and it looks like a reduced version of Hogglo Diablo. It is found in the same area as the regular Pygmy. Both are rare occurrences though.
Maybe Salo was extremely lucky. Or maybe this first Hogglo Pygmy was just an exception. In order to tame a Hogglo Pygmy a level 30 in the Animal Tamer profession might be necessary.