I just saw this... ERA, Century 21, and Affinity are the local realtor's that have a rental division. Looking on Zillow, Trulia and Craig's List for Roswell (then look for Carlsbad listings) are all places to look.
Realistically a 2 bed house that is in good shape, and safe neighborhood will be $900 (if you are very lucky) to $1200 average, and higher. Very hard to find pet friendly. Most of the larger apartment complexes are pet friendly.