I guess it's possible that con artists down in Argentina are giving ferrets steroids to increase their size, then fluffing up their fur and selling them as toy poodles, but as many people have already pointed out, this sounds an awful lot like a variant of the
"Mexican pet" legend.
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Ferrets are related to skunks and supposedly giving a skunk a vaccination against distemper made for a dog will kill it.
Also you can get a dog, even a pure-bred, from a pound a lot easier than buying a super-sized ferret.
Note that ferrets are not rodents. They're weasels.
In dutch ferrets are sometimes called 'mousedog' (muishond). Also in southafrican (muishonde) but referring to mongoose.
If you were to give a ferret some sort of anabolic ferret steroids, then you could perhaps get it to grow up a bit bigger and stockier than it otherwise would have been. The same goes for if you were to give it extra doses of ferret growth hormone (which might be but probably is not a steroid; my off-the-cuff knowledge of the chemical structure of ferret hormones is somewhat limited, strangely enough. . .). But those would only make the ferrets a few percentage points larger at best, especially when it comes to the body's internal support structure (that's why we aren't seeing many eight-foot-tall weightlifters). You can't just pump anabolic hormones into a ferret and magically produce significantly giant ferrets, unless there is something incredibly quirky about ferret biology that I've not heard of before.
So a ferret on steroids would essentially look not much different from a fat ferret that isn't dosed up on steroids. You'd have to not know much about either ferrets or poodles to pick one up and not realise that there was something significantly amiss.
The person writing “general steroids” may have thought about anabolic steroids. These may be confused with growth hormone. (I think I made this mistake myself as a teenager.) If a ferret is given anabolic steroids it will develop significantly larger muscles. If given growth hormone as a pup it will become significantly larger and possibly develop longer legs. But even with both its body proportions will be unlike any poodle pup. Furthermore, ferrets behave nothing like dogs. Moreover, giving anabolic steroids would probably make it more aggressive. This would in turn make it more likely to react violently to being treated as a dog. So I find it highly unlikely for such a forgery to ever have succeeded.