[quote=71342]
That Catcus cat has 30 HP! 

Wait, what happens when a summon's HP gets to 0? Would our summoner need to resummon or get a new pet?
[/quote]

In the case of players, HP going to 0 only means a KO, not death. So it'd be pretty much the same for Summons, they'd automatically failsafe back into hammerspace or wherever they're summoned from. After a period of rest they could be brought back.