Dogs of Bali

During the visit to Bali, I found that they have many dogs roaming the streets. Be it stray or owned as I assume those with collars are owned. However most of these roaming dogs seems docile and seldom bark at strangers. I guess is the environment which is very relaxing, at peace...
The other thing I realize, their stray dog sizes which usually classified as medium-sized seem smaller than ours.. Is it of the food they eat diff from ours??
Saw one "blackie" at Lembongan island off Bali