Dear Ken,
This is most likely not permanent but the result of laryngitis like you would get if you scream at a ball game. However, Mako is experiencing a great deal of stress from being boarded and stress CAN lead to illness. If there is any possibility of leaving her home with a pet sitter - that would really be much better for her.
In the meantime give her a vitamin suppliment containing Omega 3 fatty acids and put a feww drops of fish oil on her food daily as that will soothe her throat.
BYW: we have a male jack in the family(Cowboy) aren't they great little dogs?
Please let me know if you have any more questions. I will be happy to help.
Warmest best wishes,
Terri