I’m not very familiar with the franchise, but I did find this:

“Aside from the aforementioned meanings behind the name “Diamond Dogs,” it is also a reference to the David Bowie album of the same name, whose work has previously been referenced in other games in the series.”

The Bowie album title and the album’s group of characters by the same name are often believed to have been inspired by Newton’s dog, so MGS V is at least indirectly influenced by it.