On a serious note, I would keep an eye on your pooch. If he/she (whatever) starts watching himself in the mirror, everytime he walks by, I would have him checked out.
The next time your pills turn up missing it may not be a mistake.
LOl, that is a funny post man. It sucks, but funny as hell. Maybe you should enter your dog in some races now Look at it this way, atleast he didn't eat all of them.
The good news is that the LD50 of Oxandrolone in dogs is 5000mg/kg so the dog could safely eat 125,000mg at once if it weighs 45lbs.
Just contact your source and tell him to reship because your dog ate your stuff.