Got a Spanish Water Dog two years ago and the lady who we got her off was a dog trainer and she swore by the ‘click and treat’ method and I’ve definitely had good success with it (plenty of web sites if you’re interested) …….but never used it for nipping as the treat was used to praise, something you dont want to do with nipping/biting.
What we were told to do was that if she ever nipped too hard just act like another dog would (no, dont bite back although it might work!!?)and let out a large yelp demonstrating that the nip hurt, turn your head without turning your back on your dog and fold your arms (turning head and folding arms also works a treat to prevent jumping up at you). Its all about getting in to the dogs mind apparently……..she was a bit of a mad woman we got our dog off but her life was dedicated to dogs and she knew what she was talking about!! Everything she told us to do has worked, admitedly not always first time but always after a bit of perseverance.
Remember…….yelp loudly as if in pain, fold your arms and turn your head as if you are ignoring your dog. Sounds crazy but it really works!!