I'm gonna add my .02 cents here! 1.15lbs I would understand as "1 pound 15 ounces", if they were to say 1.01lbs........than you would be looking at "1 pound & .01 of an ounce! I know this is how we weigh our pups! We also live in canada so we usually will convert weight to metric as well as standard!
I think this was a innocent misunderstanding...IMO!
ps my friend has a Yorkie 6lbs and a huge Rottweiler (too big for a scale) and they are the best of friends......and the yorkie bosses the rottie around go figure! If you love her keep her!