Because patients forget to do routine things, family members often try to compensate by leaving large signs around the house as cues: "remember to brush your teeth", "remember to take your pills", "remember to drink a glass of water", etc.
So today I was asking a family how this method was going with Grandpa. He lives in a condo by himself, near his son, and the family checks on him frequently.
Grandpa saw the signs all over, and for unclear reasons (there are never clear reasons with these people) assumed they were meant for his dog.
And, since his dog obviously wasn't obeying the signs, he had to do something about it.
So one day the son wandered over to find Grandpa vigorously brushing the dog's teeth.
Upon further investigation, he found that, in the week since he'd put up the signs, the dog had been receiving Alzheimer's pills (no, I don't think they helped at all), and sleeping pills (no wonder he was so easy to catch). He'd also moved the "drink water" sign from the refrigerator door to the floor next to the dog's bowl.
This also explained why the dog was wearing a pair of clean underwear, since they'd put up a note reminding Grandpa to change those daily, too.
The signs have come down, and the family is looking into care homes.
The dog has been adopted by the son's family, and is much happier (though his breath isn't as minty-fresh).
The underwear has been washed, with bleach.