The Lhasa Apso and the Shih Tzu are two different dog breeds. One of the most noticeable differences between the two is that the Lhasa Apso is bigger. Their skeletal structures are also different from each other. The Lhasa Apso will usually have a smaller skeletal structure which means that they tend to look slimmer as compared to the Shih Tzu.
The skull of the Lhasa Apso will also be slimmer so you will immediately know what dog breed you are looking at based on the shape. When it comes to hair growth, the Shih Tzu will have shorter hair as compared to the Lhasa Apso. The ears will also not be as hairy.