Chocolate could cause dogs to be anxious as well as have more severe symptoms. Chocolate is toxic to dogs and should never be given to them. The amount that it will poison them depends a lot on the weight of the dog, as well as general health and age. Be careful to keep chocolate away from your dog.
Yes, chocolate causes dogs anxiety but also it can be fatal for them, it can cause, vomiting, diarrhea, hyperactivity. The poisoning lead them to elevate heart rate, coma and death.
Dogs love chocolate, but it can be very deadly for them. Your dog may appear hyperactive and begin to pant heavily. If you have given your dog chocolate please contact your vet.