Train your dog to bark less, and you’ll be doing the postwoman or postman a favour. After all, a dog barking can be loud and scary, even if you know your pet is just frightened – or excited. Happily, the answer lies in helping your dog to relax. Barking is the natural way dogs communicate, but you can even train adult dogs to bark less. “Learning works at any age,” says professional dog trainer Nadja Kopp. Start by figuring out just why your dog barks so much. Is it insecurity, aggression or excitement? Does your dog want attention, or to defend its territory or just to play? The methods are t…