I have a problem with hatching pets. Everytime my helephant hatches with any other school pets i get another helephant and i have been wondering why.
I have heard a rumor that when using a school pet to hatch you will always get the school pet graphic, But i have broken this theory because of the time i spent hatching my efreet with everything and i continuously got a winter white owl and nutcracker when hatching with them. But most of the time when using a school pet you will get the school pet graphic back.
I think its just bad luck. I hatched my Wraith with several other school pets and after 5 tries I got a Reaper and a Darkwalker. Note the Darkwalker is the ice school's hybrid pet even though i was hatching with a death school Wraith.
Recently I have been trying to improve my Deer Knight by crossing with my best Wraith. After 5 attempts I have only hatched more Wraiths.
Luck is strange in this game. Some people are crazy lucky. Others are not.