My male hedgehog is a little over a year old now (he turned a year in October). I've noticed 2-3 quills in his cage over the past two days. I've also noticed this past week he has been extremely cranky. Hissing at me, puffing out his quills, etc which is not normal for him, but he did act just like this while quilling when he was younger. I thought I had read somewhere that hedgehogs may go through another quilling when they are a year old. Could he be doing one last quilling, or might this be something more serious? I haven't changed routine or anything (no strange smells on me, no chance in environment or anything else I can think of). Thanks for any advice you can give.