Often touted as being one of the toughest sports in existence, rugby is a sport that tests the mental fortitude of its players just as much (if not more so) than it tests one's sheer athletic ability. Simply put, it takes a lot of skill, coordination, and guts to play rugby as well as a lot of bravery to even attempt playing a sport in which physical contact is not only allowed but encouraged. Dogs can learn to play rugby on a very deep level (so much so that World Dog Rugby tournaments are held annually,) as well as a number of the sports that are similar to it such as soccer and football to a lesser degree.
While dogs aren't able to play rugby on the exact same level that humans do, canines are able to understand a number of the game's most basic aspects. This makes it a lot easier to set up impromptu rugby matches with your dog than it is to set up improvised basketball games with your furry friend. Ultimately, your dog won't really care about scoring points or winning matches - in their mind, spending time playing with you is the sweetest victory they could achieve. Feel free to invite more dogs into the mix by seeing if you can get your loved ones' pets in on the game as well.