It's a trick question, of course. I voted yes because you asked about owners, and therein you make an assumption. Owners can do what they like with their property, including drugging it. If we presume that people actually own other animals, then it follows that it should be legal. The better question would ask whether people can actually own another animals to begin with.
By that logic, beastiality with one's pets should be legal as well, no?
Yes. (Of course, in such questions the presumption of legalized marijuna is valid. If we get into too many conditionals, it becomes a mind-warping game.)
But I've never really approved of the term "owner" when I see it on commercials. It offends me deeply, honestly. And I don't really subscribe to the notion that the pets are actually owned, in the usual sense. Nevertheless, if we're going to buy into that assumption, then yes, you own it the way you own a pen or a dildo or a pair of underwear, and are entitled to do with it as you please.
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