There's about a three feet difference in size between the world's tallest and smallest dogs, according to Guinness World ...

Whether you're looking to teach an old dog new tricks or prepare your speedy pup for an agility course, it can really help to ...

Reggie, a 7-year-old Great Dane from Idaho, and Pearl, a 4-year-old Chihuahua from Florida, put their (size) differences ...