DANIEL - 306807 3/3/2015 5:16:23 PM We have a 4 year old male Leonberger named "BUCK" He's at the larger end of the size scale, 321/2" & 170 lbs. and is in excellent shape. Due to his large size we have his veterinarian look him over every few months just to get his opinion. We have given "BUCK" a pro-biotic pill since we first got him at 8 weeks old and he has never had any type of digestive problem.He is very active and walks 3-5 miles Everyday no matter what the weather is.. He is just GREAT dog.