Can ferts hear dog whistles that are inaudible to humans? I'd like to train them to a whistle but i live in an apartment, and i don't want the nieghbors knocking everytime i call the kids. Thanks, jana (mom) brezzie (sleepin' go 'way) reena (i'm gonna be 1yr old soon! presents!!!) sammie (what's a vet mom? why'd i got to go?) [Posted in FML issue 2312]