1) Dead bodies don't tend to be at the shrine. XD They can revive a body wherever it fell. As long as you don't level up the dead pet (as in, it's dead. Dead body doesn't move, dead body doesn't get stats for 'being' in the RP. It's just there as an object), I don't mind if you use it in the roleplay.
1b.) Again, dead pet can't level up (that's why we don't let you RP them while they're dead), but sure. You can include a flashback if you'd like.
1c.) Pretty much answered this already. But yeah. Even if the dead pet is used as an object or in a flashback, they're dead and receive no levels.