Feed you dog in the same bowl. Never out of your hand – do not chuck the food on the ground.
Here in SA, the poisons commonly used cause a pins and needles sensation in their legs. If you watch your dog, you might see that he is licking his legs. Give him activated charcoal powder immediately to detox and take him to the vet. Being very careful not to touch saliva.

I’ve pulled many horses through with activated charcoal – ate poisonous plants after first rain. Activated charcoal very good to have in medicine cabinet for yourself as well.