Adam, perhaps Sunny is a little hurt about your dad leaving him. Or at least that might be what is happening. In your dad's place I would just go about the day as if everything was alright. Treat Sunny as always, well maybe a couple more treats and sweet talking, and hopefully Sunny will go back to being his loving self. My Ana Grey was PO'd at me a few days ago and didn't talk for a couple of days. She is fine now, she was just punishing me I guess.