Posted at 2014-09-03 13:21:36 — Link
If you list one of your own male pets for breeding and breed them to your own females through that lot, it counts towards the weekly (and overall) leaderboard. Which doesn't seem exactly fair: anyone can get to the top ten of 'weekly breeding trade' with that trick, as long as they have enough stable space. Without doing any actual trading.
I've noticed some users abusing that extensively, week after week. Probably to ensure that they stay in top ten and get the free gold each week.