It'll do more harm then help
im afraid of it too. the female i mentioned for example has very hard and full muscles, don't think it's just genetics. But i didnt compare enough to say whether it really matters regarding only the weight of a dog. . forget the whole chaindog/housedog thing. what i mean is would a similar dog be shown heavier because he was worked allot(to much) more during daily maintenance (outside the keep) sorry peeps, trying my best to type english.

ps: that's just regarding the weight, i would be interested in other negative effects of excessive muscle as well, like lactic acid. but i will make a new topic for that.