S.
Something you didn't mention and I was wondering was, did your DD stay in your room with you when your DH was away?
That might be the issue.
Although I will share that my DD a few months ago in the spring had some issues with noises simple as they may be it frightened her and she would get up several times every night, she too thought someone might come in and get her...We had night lights right beside her bed.
We too have a dog who has a keen sense of hearing. We were NOT getting any sleep!
What we did do and it was successful was print off a calendar
http://www.dltk-cards.com/calendar/
They have favorite kids characters,animals, holiday etc...
So we print off a calendar and got small "SMILEY" stickers (these represented "being happy" as mommy and daddy would give her a sticker on her calendar for each night she stayed in her bed, as we were "happy" that everyone got their much needed sleep. :)
The deal was that if she stayed in her bed and got 5 stickers out of 7 (days) she earned $2 that week to spend at the Dollar store or trade it in for Disney Dollars.
I will tell you it was the FIRST thing we did in the morning when she got up as she was proud of herself and come the end of the week she got her $2 and then could decide what she wanted to do with it.
It only took us about 2-3 wks and that was it... problem solved and she never mentioned it again.
Remember S., sometimes it is trial and error to see what works, just don't give up.
Remember too to DO WHAT IS BEST FOR YOU AND YOUR FAMILY.