If you are in Thailand perhaps you can find out for yourself by checking other dealers and websites and so on rather than relying on the info of a friend who maybe has a motive
Exited BKK in August through automatic gates with re entry permit returned October still had to re enter the old way but being over 70 could go through Thai gate with my Thai wife so still got a stamp but avoided long line up
Be aware also that most vetranarians in Thailand do not believe in assisted dying of pet dogs should the need sadly arise .This is for religious reasons. I hope that such a decision would never need to be made however it is wise to be aware. The dog in your photo looks in great shape. I say what I did because you said your dogs were seniors.