Boldenone is the pet steroid. I certainly wouldn't give it an oral, since, often, things that are fine for us can do lethal damage to dogs, and I'd be concerned about its getting, literally, bitch tits from the test.
On the aspect of orals, both chocolate and onions can do damage to dog livers. Our standard painkillers are toxic to cats and dogs etc, etc. Never assume that something is safe for pet consumption or injection simply because it's cleared for human use. We are different animals.
Do a search for use of testosterone on dogs. I'm sure I read somewhere that it's medically contra-indicated.
I'm not going to touch on the ethics. People do some strange things to animals in the belief that it's in their pet's best interests. Research is even more important than for yourself since the animal can't tell you that it's experiencing symptoms and, for example, got a headache that's about to lead to a stroke.