probably winny, as they do give it to many show dogs for a shinier coat and better muscle definition. It will probably be very expensive though. I wouldn't do it, just because I see no point in paying money to have someone else show off my dog, and you don't even get to spend as much time with your dog as well. Rotts only live around 8-9 yrs. Now if I had a rott or another supposed to be big dog and it turned out to be a little runt (like my roomates rotty, small as hell) then I might give him/her some juice. Not that it is ethical, but if I pay big money for a big dog, that dog is gonna get big one way or another.
If someone says that gear is not for animals and is bad for them, well then they just basically said
steroids are harmful to anyone/anything. I know they are safe in humans at reasonable dosages... likewise with any animal.