They are very very stubborn...wost then most terriers.Very independent,STRONG willed,dominate,and suspicious...I HAVE met a few very sweet Lhasa Apso dogs though!A lady that lives by me that I see at the park frequently says that they(her 2) really make her work...almost like she must earn their respect first before she asks them to do anything.But they are sweet dogs and love playing with my dogs,they are pretty outgoing...though they bark up a storm.If they decided they don't like you you will hear it,that's for sure.
DIfferences are...longer nose,different coat,bred to be guardians of the house shih tzu dogs were bred purely for companionship..
Hopefully the dog on petfinder wont have any major socialization issues that you wouldn't be able to sort out.Maybe the dog will be a sweet fun loving companion and wont have too many negative traits.
And most of the shih tzus that I have met have all been really sweet and laid-back as well.
AKC description.
Their temperament is unique: joyful and mischievous, dignified and aloof. An independent breed, the Lhasa's goal in life is not necessarily to please their master. Popular in the show ring, the breed also excels at activities that provide constant challenges, such as agility.