OP, you do not want to leave your dogs outside unattended, we do have wildlife that may attack the dogs, especially if they are small ones. Also, be careful of the access to "your" back yard there are versions of the houses where the neighbor has full access to the side gate (you cannot lock it), so if your dogs are out, they might accidently get released.
There have been several threads on this issue in the past, with lots of additional information, please try the search function and be sure to ask questions on any house you are looking at.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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