A Maryland family is pleading for help to find their 4-year-old son's emotional support dog.
Sandrine Hildembrand says their dog Macks helps keep her son Mathis calm. Mathis has Coffin-Lowry syndrome, a rare genetic disorder that includes skeletal abnormalities and developmental delays. Get Breaking News Alerts With the NBC Washington App "He's a lot more anxious. I can tell. I can feel it," Hildembrand said.
Macks went missing June 10 after he ran out of the back gate of their Potomac home...
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