Following in BGs

Does some one has a tutorial on how to actually do this? I' know it works because I seen these WOD videos:

https://www.youtube.com/watch?v=4Tvgrb6GiQI


Anyone got a guide? The video comment said interact with pet but I can't get that working.

[lax]

http://www.dual-boxing.com/threads/51263-BG-follow-MKIII-using-Brew-pup-%28isboxer-setup%29?highlight=%2Ffollow+mkIII