Elderly 14 to working Cocker. I usually feed her whilst I cook dinner and make breakfast but DH made dinner last night (happens once in a blue moon) and so I forgot to feed dog and he didn't. She's old so she didn't kick up a fuss 
She's been up since 2am being sick (foam) and I could hear her belly rumbling so I realised, ran down and fed her... But she's refusing it. She's even refusing roast chicken from the fridge 
Any ideas to encourage her to eat? She's currently (4:30am) panting and pacing.