Tugging, pulling, and running away: lessons from a chihuahua

About four and a half years ago, I adopted a sweet, wonderful, chihuahua mix from a shelter here in LA. Since my dog, Abby, wasn't a puppy when I rescued her (she is almost 9 years old), there are a few things she's learned...and a few things she hasn't. They do say that you can't teach [...]