I'm not sure you can get the medals back. The best thing I can tell you is to PM a staff member (would recommend Myz) with a pic of your character and pet.
I do whish there was a preview option in game but since there isn't it is best to just accept you made a mistake and move on.
Silver medals are not too hard to get though, there are many quests that give them. And remember, if you pick up broken medals, 2 of them equal a bronze medal and 10 bronze medals give you a silver medal.
