Although pine cones or needles are not poisonous, pine oil, which is produced from the tree and the needles does have an irritant effect on dogs. It may upset their stomach, but the oil is not fatal. So, the answer to this is that pine needles, pine cones and dogs do not mix. If you see him or her eat one you do not have to rush off to get your dogs stomach pumped, but it would be wise to keep them away from these items just to be on the safe side.
If you are ever worried about your dog's health then seek advice from a qualified vet as the advice we give you is not professional and veterinary advice should be sought after if you are worried in any way about your pet.