Watch a black lab fetch her deaf sister.
Betsy is a black labrador who is deaf as a post. When it's time to go inside, getting her attention can be a laborious process (badum-PSH). So her owner came up with a pretty unique solution—have her sister Buffy, who is not deaf, fetch her.
On command, Buffy will run to Betsy, grab her by the collar, and escort her home. That's sisterhood for ya'.