they get into more trouble....my husband bought me my first yorkie and rodney was so miserable, he would chew everything, so the vet said he was bored and to get another one, then we got dusty...they chewed twice as much, thank goodness it didnt last long. you could not seperate them...if one had to go to the groomers without the other one, they would whine and cry the whole time, i finally starting taking both of them even if one didnt need grooming, same with the vet...two years ago, dusty went to rainbow heaven and rodney became very depressed. the vet even talked to us about putting him on an antidepressant...(we didnt do that). 2 weeks ago, we bought another yorkie (Diesel)
and it took Rodney about 3-4 days to get used to the new puppy, and now they sleep together and play together. A short answer to your question is, I think two yorkies are good comapny for one another especially if they are home alone for more than a few hours at a time.