I am wondering if anyone in CTR land can help me! We have a 4 month old English mastiff named Diesel. He is an absolute joy except for the biting. He will lunge and bite at my husband and I. He doesn't really bother the other dogs in the house. Mostly it is just that he is playing,but it has to stop before he gets any bigger. I have tried everything I can think of from bitter apple spray to grabbing him by the nap of the neck in order to get him to stop. Any ideas?