Food safety
Can dogs eat corn on the cob?
No — don't give this
The kernels are fine; the cob is one of the most common causes of a surgical blockage in dogs.
If your dog has already eaten it
Call your vet the same day.
Being honest about this
Dogs differ, and amount matters — a crumb of something rich is not the same as half a packet. Treats of any kind should stay under a tenth of what your dog eats in a day. If you're unsure, your vet would far rather take the call.