I live in Green Valley. Both of my dogs tested positive for roundworm a few months after we moved here from Miami - they had never had roundworms before but we think it may have been contracted in all of the stops / hotels we stayed at out driving from Miami to Las Vegas. Legacy Hospital treated it and both are worm free. I did use a steam cleaner as I have all tile and wood floors. I do not have any grass nor do I have a 1/2 acre - I envy you. I was really concerned that my husband and I would get roundworms and did wash everything. Agree that you should treat the carpet - Nature's Miracle is great.
Good luck with Sunny. Let me know if you need any information re vets, food, etc. as I spent a lot of time doing that after we moved here in Dec. 2012 and have been through a lot of the years with my GSDs.
Murphy, forever in my heart, 11/1/98-10/1/12; his BFF Allie, 5/12/05-2/7/16 and Ziggy (4 year old mixed Anatolian Shepherd/Lab)