Hi Carolyn,
Bringing Murphy to CR will be hassle-free. I brought my own two dogs, Jester (standard poodle) and Shadow (Havanese). No quarantine in CR is the big plus.
No need to get anything translated. But there are some forms you need from your vet and from the USDA. And shots should be up to date. Another big thing to keep in mind is that some airlines don’t fly pets or have certain restrictions. So check before you book.
I wrote an article on the process, with links to sites with all the details. You can check it out here:
https://internationalliving.com/2012/06/how-to-travel-with-pets-to-costa-rica/