This is for Hua Hin Immigration:- To do your 90 day reporting at HH Immigration Office, all you need is your Passport (if there has already been a TM30 lodged). Nothing more.. just your Passport.
Let the guy take as much time off work as needed to look after his dog. You are not obligated to pay anything to him if he chooses to take time off work!
do you understand how the biometrics work? When the OP comes back he will need to supply fingerprints.. do you understand that the fingerprints are unique and all details relating to such finger printing checking will auto-populate on the IO's system. (also Immigration do not care how long the line is by the way).. So, if multiple 'passports' appear, of course they will take a look, and make sure it is not suspicious. Do you not think 'criminals' have tried this before? Recently some-one from UK I think it was tried to get back into Thailand after 15 years on a new passport (being a wanted person in Thai for 15 years) and got arrested! Sorry, but I disagree totally with your statement.