What would you think about me asking my boyfriend to walk his dog 4-5 times a week?
OK, why would  you ask him to do that?
I want my dog walker trained well.
You shouldn't be bossy towards your boyfriend. You should let him walk the dog as much as he wanted.
It's okay as long as I have my reasons.
You will ultimately get what you want more if you are not bossy to your boyfriend.