Buttons are fascinating – really! If you doubt it, read this.
More specifically, however, the etiquette and rules of fashion surrounding buttons are the really interesting part. Did you know that the purported reason that men don’t button the bottom button of a vest or suit coat with more than one button is a vestige from Great Britain’s Edward VII who gave up trying to fasten the bottom button his over a 48-inch waist. Etiquette called for society following his lead, and men have been leaving that bottom button undone ever since. To be fair, there are those who would argue this story. Some fashion historians say the practice began with hunters wanting to be more comfortable on their mounts, others say it started with a few fashion-forward dandies who wore two waistcoats at once time and wanted both garments to be seen. There’s even a legend that says a group of students attending Eton, an exclusive boarding school in the UK, formed a club called Pop, and adopted the look as a sartorial secret handshake.
And you thought you knew buttons. 
Many breeds have what’s called a “button ear,” breeds that include the Pug (which may also have a “rose” ear), and the Jack Russell Terrier. At first glance, these ears look semi-pricked, but more than half the ear is folded causing it to sit well above the level of the skull, the tips pointing towards the eyes. The leather of the ear covers the opening to the ear, and since the fold tends to be longer, it covers a larger amount of the ear. The ear canals of button eared terriers are protected from dirt tumbling in from the sides of the tunnels where these dogs work.