Meet Aspen, the 4-year-old Austin dog taught sign language

AUSTIN (KXAN) — There's the age-old expression that you can't teach an old dog new tricks. And then there's Aspen, a 4-year-old Austin dog taught sign language through the Austin Humane Society.Aspen came to AHS in May from the Bastrop County Animal Services shelter, where she was at risk of being euthanized. After arriving at AHS, volunteers realized Aspen was deaf and unable to respond to verbal commands.(Courtesy: Austin Humane Society)(Courtesy: Austin Humane Society) But how exactly d