Hi. Our 3 year old is a real sweetie, initially he's cautious meeting other dogs but as soon as he senses they are friendly he loves playing, especially chasing. He normally does the chasing and all is good. However recently we've notived that he does a sort of growl and bark when the other dog stops or turns towards him. They are still playing and chasing and he's probably doing it out of excitement but I'm not sure if we should stop him doing it as I don't want the other owners to think he's aggressive because he is a real softie. Should we stop him and if so how?? Thanks