I train guide dogs for the blind. When I was just a puppy-raiser, with my first dog, we were doing so well that I decided to teach her extra stuff than the ones we were appointed to.

Among those was to turn the light on in a room for me. Didn't realize how stupid that one was until I started visiting the blind people, and they told me to please not forget to turn the light off when I leave, as they then get huge electricity bills for nothing. Ooops!

Another thing I did was teach the dog to open doors, and she was big enough to do it without the need of a rag attached to the handle. She learned that pretty quick in a couple sessions. Now these service dogs can come wherever I go, so it took me quite some days until the situation came up that I wanted to leave her home while I leave. I do my usual routine, say bye to her in my bedroom, close the door and get ready to leave. My dog is there. Oh no, you are staying this time. I put her back in my bedroom, get ready to leave and... my dog is there again, next to the front door, eager to leave and ready to open that door too. UH-OH!!! I put furniture in front of doors and double locked them, and from that day on, I forbade my poor girl from opening any door ever again! (for the blind she simply has to indicate doors or handles)

And last inappropriate task I can think of is this: (not really a task but definitely inappropriate) smelling between people's legs. My puppy did it a lot, and I'd redirect her when she would do it. She does it in the most embarrassing way, she'd really stick her nose to the crotch and make a snorting nose as she'd smell it. I did sort of teach her not to do it, but mostly when she was on duty. When she was in relax mode, I'd kind of let her do it (by pretending I didn't see it happen). That's because I am pretty sure, no one would dare explain to the blind person that the dog is smelling their crotch in a too embarrassing way, and it made me giggle when I thought about it! (it's quite possible the guide dog school trained it out of her, but I can always hope...)