In the "Pets" menu there should be at least two more choices:
"Sorry, I already hatched today" and "Sorry, I don't have enough gold"
Also, it would be nice if in the "training" quest, where you learn about pets, if there was an explination that not all pets make hybrids, maybe something like "and when you get your special school pet, you'll have the chance to make new powerful hybird pets that don't look like either parent."