This may be considered OT as it is about a cat (shock! horror!) but I think
the principle is applicable to dogs, if you don't think that is possible
then read no more.

This happened many years ago when I was young(er) and (more) foolish. My
wife and I were poor students and acquired a kitten, he was a siamese X
short hair who grew to weigh in at 15 lbs while being quite thin - he was
tall and solid muscle. His name was Ishmael, the biblical scholars will
know that he was a ******* son - which is a clue.

We had this idea that he was at risk of taking poison as some cats had
suffered this fate in the district. So we tried to teach him to take food
only from us. This took the form of teaching him to eat from our shoulder.
He would happily jump up on your shoulder at meal times and get fed. We
thought that this was kinda cute and he was very gentle and sure-footed
never hurting us.

We moved house to share with another student, a young woman who was quite
happy to have to cat too. About a week after we moved in, in the morning I
was in our bedroom while the flatmate was cooking her breakfast. I was
jolted by a blood-curdling scream from the kitchen. Her cooking skills were
about the burn water level and I thought that she had cut her finger off. I
rushed in to find the flatmate jumping about the kitchen wearing a flimsy
nightdress with Ishmael on her back, she was screaming "bloody cat!" at the
top of her voice. It took a minute or more to calm her down enough to stand
still so I could lift him off. Their relationship was never good after
that.

It took a while to reconstruct the crime. It seems she was half asleep
cooking bacon. He smelled breakfast and took his usual route to get some.
She was taken completely by surprise and tried to shake him off. He held on
using the hooks that nature provided. The claws penetrated the nightdress
causing her to caper and dance all the more, causing him to hold on even
tighter.....

The moral of the story is twofold. Firstly, you *can* train a cat but
always remember that while a dog will do your bidding just to bask in your
approval a cat does whatever is convenient at the time. Secondly, do study
the logic of what you are trying to do before you start or the outcome may
not be what you desire.

David