Billie, Pasha's advice is right on, including the recommendation of the Schnauzer...
Being that I myself am a stickler for security, I would recommend that you do not have a simple framed security bar unit installed in your window. Have the company remove material from the wall itself, and have the bars actually imbedded into the wall. The work would not be too expensive in the D.R. You wouldn't have to worry about someone prying the frame assembly off. Barring a hacksaw or a torch, it would be difficult to circumvent. Here in Italy, the bars are commonly seen, and the artistry is exceptional.
As far as the sliding door, I would also go that 'extra mile' as it were, depending on the value of your possessions... I would have security glass mounted on the sliding door frame. It is a laminate with a lexan or similiar inner layer that can take more than a few sledgehammer blows to compromise the barrier. It might cost a bit for the panel, but the labor in the D.R. is not high. If neighbors know of the valuables you keep, word might go out even in a matter of fact way, and you might become a mark...
Have a carpenter remove your present main entry door, and if it is a D.R. pine job, have him reinforce the inside with a nice peice of high quality plywood. Invest in very strong stainless hinges, and a quality deadbolt lock. I myself would affix 1/16" thick steel strips inside both of the door's jambs, and drill them accordingly to accept the hinge screws and the lock's bolts. You would be wise to also place a 6" length of steel right up against the jamb atteched to the door, placed near the lock, so that your door can't be jimmied. You can have all this artfully done if you find the right technician or carpenter.
Most of the crime in the D.R. is low tech, but with the increased financial hardship, continued deportations of felons from the U.S., etc., a small investment will bring you great peace of mind, and make your stay in the D.R. even more wonderful.
Best wishes!