How much exercise should a puppy up to 9 months old be given?

be tween 8 and 10 months you can both have half an hour at a smart pace .this controlled exercise builds up muscle do this untill your dog is an adult dont let your bullmastiff run loose and gallop in fields injuries to legs and other parts will occur in plenty. the bullmastiff gains maturity in two stages height is gained in the first year maturity follows over a longer period. when the body will widen and drops to give depth. so you can appreciate excercise must be controlled at this stage. (I advise you to buy the bullmastiff book by lynn pratt) never walk your dog to the stage where he pants excessively he should come back as fresh as he went out. never walk your dog in excessive heat do not walk him on a full tummy and always towel dry a wet dog . after a long walk only offer a small dish of water about 15 mins after walk hope this helps. and good luck with your bullmastiff mari