I have an english mastiff puppy. He is about 8 months old and weighs about 175. he is very big for his age. Not quite fat but definitely big. He does come from very good stock and he will be a massive mastiff. Well, he hurt his elbow. About a week ago I noticed that he was growing a tennis ball lump on his elbow. It is soft and not hard but not squishy. I talked to my breeder and she said it is possible he hurt him self. He has fallen a few times on our walks as he is not the most agile breed. We do our best to keep him from jumping and running around. But he is a puppy. I know this problem is common with large breeds but I wanted your guys advice. We have laid off his walks a bit. the breeder said It could take about 6 months to go away. So what do you guys think? Can I help him in anyway?