Anyway, the little beauty on the left is a Japanese Chin. The two older looking dogs below are both Japugs. In this case 50%Chin and 50% Pug.
The two older dogs are apparently from the same litter and as you can tell from their grizzled countenances about ten-years-old. I looked in vain for a Japug in costume. The one costume that I found that had some Japanese context on Amazon isn't dressing a pug but the neck and chest sizes looked like they would do the trick.