Mandy, I don't think it will be a problem at all. I'm not sure when the article Linda read was released but but over the past few years head halters have changed and more varieties and brands are on the market and we have always been able to find one which fits any dog head shape. If you take a look at this thread
Acclimating your dog to a Gentle Leader (LONG) Kim and Claudia both mention a GL brand of halti designed for shorter nosed dogs
Sharon