Just an observation. Anyone who travels to Thailand knows that there are dogs absolutely everywhere. Many are malnourished and flea bitten with all types of skin disorders and injuries, especially in Bangkok. Having said that most of them also have collars.
The reason there are so many dogs is because none of them are desexed so all they do is breed (while on Koh Samui I saw two dogs doing it in the middle of a relatively busy highway- observation two).
Because they breed so much, there are so many litters of puppies, so many mouths to feed which, my last observation, leads the poor bitches to all have very saggy boobs!
Says something for adoption huh?