what happens if pet die arena?

i am talking a about wolf, strider, cougar, sin eater and etc..

what happens if it die in arena? do need need a scroll to rez it?

Yes you need to res it in the normal way. However it shouldn't lose exp if it does die in the arena.

if i dont rez it when it died in arena, it will be gone forever?

what happens, when pet dies when u are farming, and moster kills him.. ?

any time a pet dies regardless of where it was killed and what killed it, you must res it or it will dissapear after 20 mins and never ever ever come back