Unsurprisingly, most animal drugs aren't much different than the stuff hospitals pump into us. (Try not to dwell on the fact that your healthcare's probably not much better than your pug's.) Heavy-duty pain relievers (like Tramadol), Valium, and even ketamine are generally available to ailing animals. The main difference between human and animal medication seems to be that one of them is a lot harder to obtain. Most of our happy pills are controlled substances, which means they're carefully tracked. That's not the case for animal meds, though, because nobody expects a horse to get hooked on ... uh, horse.
But until legislation is put into place to stop these druggie pet owners, some states have started educating vets on how to deal with addicts coming into their practice to get high off their cat's supply. They're mainly taught to recognize suspicious behavior, like when owners try to get refills early, or ask for medication by name, or pretend their pet fell down the stairs but then not immediately show a YouTube video of the fall to prove it.
But what if your pet is just too damn healthy to exploit? In 2002, one owner was caught having trained his dog to cough on command just so he could get his hands on some sweet cough medicine. But that takes a lot of work, so some addicts just resort to intentionally hurting their pets to get a fix. In Kentucky, a trash monster named Heather Pereira was discovered to have cut her dog with razor blades as an excuse to keep getting her paws on his pain medication. She was sentenced to four years in prison (28 in dog years). But that's small potatoes compared to one small drug ring in Oregon, who used a puppy mill as a front to amass over 100,000 Tramadol pills, neglecting the puppies to the point that their crates had been flooded with their own feces. Those assholes managed to find a way to make standard drug dealers look like pillars of the community.