Hi Michael,
I've done some research, and it seems that there is literally no meaning for this phrase. It's not a known idiom or proverb in English. If you can interpret some meaning from it, then that might be a good thing anyway. :)
It seems like this list is often repeated but never checked, and generally the people who post this list are non-native speakers. Have a look at the search results: if native English speakers aren't reposting this list, then you have a right to doubt its authenticity,
There are a couple of variations of this list (one list doesn't have the dogs/ambassadors sentence) and to be honest, both versions look like careless translations into English.
If the list isn't "authentically" from Harvard, I don't think that's a problem, but the advice isn't really that good. Anyway, that's just my own opinion. The list would have some value if we could find its origin, but so far I've found nothing.
