That truly depends on where you're asking this question about and what your definition of pet is. :) I live and sell real real estate in St. Andrews Country Club, Boca Raton, FL and we have a written "2 pet" restriction, but personally I have never seen it enforced. If you have questions about a particular community, please feel free to email me and I'll let you know the "written" published regulations of that community in Boca Raton. I will also supply you with the telephone number of a representative of the community who can talk with you personally about the enforcement of such regulations.
Remember, if you have an unusual pet (elephant, zebra, horse), I'd let them know that when I called.