All Dogs regardless of their size and Breed need to Walk & Exercise, I walk all 3 of my Yorkie's at least 2 times per day. Once early morning and then late in the Evening when it's cooler. The 2 older ones Artie is 4 yrs. old and Abigail is 3 yrs. old hardly play with me and each other but Pom Pom their daughter is almost 2 yrs. old and she is constantly chasing something or trying to play with her Parents. They love to sleep and Lounge around, especially when we are watching TV. As your Dogs Pack Leader it's up to you to control what & when he does it, it sounds like you need to make more of an effort(no offense
to you) to keep him more active since Yorkie's love to eat, otherwise you will end up with a chunky monkey!
You should try to be more active so he will keep his weight down?