Shopee; Ultrasonic dog deterent, 80 baht. Sorted....
Stops the pack of soi dogs from congregating and barking/howling outside my front gates. No audible sound to wake the neighbours. Flashing torch light and ultrasonic audio and they disappear. Dont know why it took me so many years to get one. I will upgrade to the motion detector models for the gate entrances and keep the handheld device on my motorbike in case of being attacked whilst on the roads. Hope this info can help some of you with similar problems.