I plan to spend about 6 months this winter in Panama. How difficult would it be to bring my old faithful Rosi with me? Any comments would be appreciated.

"Difficult" as pertains to regulations in Panama, or "difficult" as Rosi might define it?

There is a detailed explanation of what is involved in bringing a pet into Panama at http://groups.yahoo.com/group/panamaforum/files. Click on the file entitled "Pets in Panama."

Go to the thread in this forum Bringing Pets Into Panama. It tells you everything you need to know. I recommend contacting Jose Saenz to help you. There is a lot of work you need to do before you leave, but he can help you on the Panama end.

Taking the dog back out also has some requirements. Unfortunately nobody has given the details on exactly what is required. Perhaps Jose can help you out with both ways. His email is Jose link
(bocasfrog@yahoo.com).

My main concern is the Panama difficulties.

Are you coming from USA or UK. If UK - email me on judith501@hotmail.com and I can tell you all about it as we just moved to Boquete from UK in July and brought our dog with us?
It was a hell of a process