just a few questions about the blue heeler, my new pup is 10 weeks old. i dont plan to breed him, what is the best age to fix him? i want him to stay stocky and i also want his coat to keep its current colors. i know with certain animals such as horses that fixing them (or gelding them in the case of the horse) has a great effect on there stature as an adult. i dont want to fix him to early because i love the heeler confirmation. but in the same respect i dont want to wait to long in an effort to reduce his aggregation with other dogs. he isnt really all that aggressive but he can play a little rougher than i would like. for instance he is 10 weeks old and he puts my 10 year old dobe in his place. granted my dobe is a total sweetheart and a big pushover but my heeler needs to be a little more respectful. also when playing with either my other dogs or with me he is very very energetic and can be a little nippie, but while playing i pick him up and hug him he is a total lover and will lick your cheek and doesnt show a single sign of nipping. set him down and its back to rough play. im assuming this is all normal. any thoughts or advice is appreciated.