Boxer female puppy got agressive and bit the behaviouralist

during today's dog training session, our boxer became aggressive and bit the behaviouralist. This is the first time this has happened. What can we do? we have a 4 year old son and are now very worried.
Posted: 23/10/2010   

ANSWER: Boxer 6 month old female puppy
I am rather surprised and has the dog shown any earlier signs of aggression?? Also was the dog forced and/or cornered?? I really cannot give you any advice over the net - if you are in MEL, please contact me so I can help as this is a worry but should be addressed ASAP by a good trainer.
Posted: 23/10/2010

In Melbourne? See www.k9coach.com.au for local dog training services