Thank you for your great feedback. Glad you like the design/functionality - we knew that had to be top notch.

Your Threading Replies idea is one that has been requested many times and will be implemented soon - actually we just wrote a post about it http://barklesapp.tumblr.com

To go into more depth here: Threaded replies will allow both sides to interact - so if you are on the Bark side you can still reply to a response on the Bite side - vice versa.