Looking for a mad dog barbarian build

[Magenta]

I recently bought Pathfinder, which I really love so far, and now I want to roleplay a chaotic good mad dog barbarian(single class only), which sounds really interesting and flavourful, but I am pretty new to the mechanics. So I was wondering if anyone has a good build I could use, and maybe suggest a good animal companion as well. Thank you.

[SarmatII]

You want to maximize trip & attack of opportunity, get a pet that can trip such as Wolf, Dog or Leopard. This way, when your pet trips, you both gain extra atks. Grab a big 2H, go HAM on STR.