My Jack Russell Terrier wont eat his food but likes grass

by Emma
(Braintree Essex )

Hi,
I wonder if anyone can help. My JR is food phobic, he wont even walk past his food bowl. He will eat things if you feed them too him but even if I leave my plate on the floor he wont touch it.
He does eat a lot of grass when out for a walk. He seems fit and healthy and energetic. Hes 7 and an only dog. I have cats and he lets them steal his food but never eats theirs.
Any ideas?

Thanks.