You cannot educate dog owners; they are blinded by sentimentality. Thailand is 80 years behind Europe in dog legislation/enforcement because of people like you. The average uneducated Thai sees nothing wrong with allowing dogs to run freely in traffic; to defecate/urinate anywhere even in school playgrounds; owners are deaf to their pets' noise throughout the night.
This insensitivity, I suggest, is not solely due to emotion but perhaps a lack of intelligence?