"How many animals can I have at any given time? (from the FAQ)
During the course of a scenario, you may have one combat animal and as many noncombat animals as you like. Noncombat animals (ponies, horses, pet dogs, and so on) cannot participate in combat at all. If you have so many noncombat animals that their presence is slowing a session down, the GM has the right to ask you to select one noncombat animal and leave the rest behind. A summoner's eidolon is considered an animal companion for the purposes of counting combat and noncombat animals. If you have more than one class-granted animal companion (or eidolon), you must choose which will be considered the combat animal at the start of the scenario. In general, a mount, a familiar or mundane pet, and your class-granted animal(s) are acceptable, but more than that can be disruptive."
So my question is, if I am riding a riding dog or horse and have another combat animal alongside and get surprised into initiative, does my mount just *poof* disappear? Am I assumed to have jumped off (as a free action) and the mount has run away? Or am I still on the mount who, being a 'non-combatant', is effectively invulnerable?
It is a big question for a gnome/halfling, who can go from 40' to 15' if the mount disappears.