I would definitely call the animal shelter. It sounds like they offer a lot of support for adopters.
What kind of food are you feeding? Several of my dogs have been big (between 80 and 90 pounds) and very active never ate more than 5 cups of food a day. You are very likely over feeding him and this is probably the direct reason for the poop in the house. He has been house broken otherwise so something is wrong--as in he couldn't hold it.
Therefore, there is no point in scolding him and making him cower under the table. You are trying to build a trust relationship with him right now. This does NOT call for tough love of any sort. I have had two dogs who behaved like he is behaving right now. I had to use a completely different style of training than I have used with other dogs. I can honestly say that neither of these dogs would have been a good fit for most households, especially one with kids.
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
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Gio & Varda, the krazy kittens
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