The article says that although hip replacement surgery for larger dogs has been around for a number of decades, "micro-hip replacement for cats and dogs weighing 6- 30 pounds began in the last five years."
Read and enjoy the full article (and see Lili the pug in full agility mode) here: www.nytimes.com/2011/01/17/sports/17dogs.html?ref=sports
Parental Unit, of course, is delighted with any medical advancement that will help me and all the other faithful companion animals of the world live longer and pain free. She "fondly" recalls the days when her dear departed, Wire fox Terrier, Carson, had the ligaments in both knees replaced by a traveling orthopedic surgeon...and she's hoping (and I've got my paws crossed) that my joints stay just fine for the next, say, 20 years or so.
Unfortunately, this is the extent of my agility training today...