This is gonna sound crazy, but I wonder if they checked and swabbed the dogs for evidence. Fibers, hairs, blood, skin, DNA on their paws or mouths.
Did someone give the dogs a big steak to keep them distracted while they did this, and was there evidence of it? Did they jump up and scratch the killer because they were excited to see them at first, leaving DNA on their nails? Did the dogs have GSR or blood spatter on them?
I know it's been reported that they're not friendly to strangers and would be difficult to handle for LE, but I've seen a case that was solved in part by this type of DNA evidence on a dog.
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