After more than a year now since the 3.4.0 update added Pets to the game, I can say with certainty that the system should be majorly retooled.
As a very late-game player (Level 1235 last I checked), pets are quickly becoming a major roadblock to my progress in increasing my kingdom power. Currently, 7 different kingdoms require me to level a pet to level 20 in order to continue improving my tributes and get better stat bonuses.
However, this progress has been aggravatingly slow, mainly due to the fact that the vast majority of my pet events occur when I am busy, working, or even asleep.
This system is the only one in the game which puts such a harsh time restraint on players; I can’t wait until the evening to do a pet event, I need to do it now or I miss out on the progress towards completing those kingdoms.
I feel like the Guild aspect of pets is a cool and fun concept, that encourages players to compete in PvP for not just their own benefit, but for the benefit of their guildmates as well. However, these time constraints, especially on such an important aspect of late game progression, are quite frustrating. One suggestion could be that each Pet Gnome killed grants all guildmates a sigil, that can be spent to unlock a random pet event.
Please consider reworking this system, for the benefit of those players who aren’t online 24/7/365.
P.S. Also mix cosmetic pets back into the normal system, waiting a year after the pet was originally released should be more than enough.