Poor Ivy! I hope it's nothing serious. Although it could just be he has an unusually loud purr. Ever since my Luna learned how to purr, she's made sort of a coo-ing sound along with her regular purr (sometimes she's so loud you can hear her from the next room). The V-E-T said there's nothing wrong--it's just how she purrs. I hope it's the same diagnosis for Ivy and there's nothing the matter with him.

Keep us posted on what happens.