Dogfights is a minigame where you can watch two npcs fight and possibly bet if you wanted to.
The command to spawn a fight is ::fight NpcId NpcId and the command to watch is ::dogseat.
Some examples of ids are as follows. Note you only need to enter the number not the name
Rock crab 100 Viriditas 2481 Pharaoh King 717 Demonic Gorilla 7152
Will add more npc ids in time but you can experiment with random ids to try out.