Curry powder is a mix of spices. It contains things that are harmful to your dog. If you feed your dog curry regularly, then eating curry will have a long-lasting effect on your dog, and it is very likely to make them sick. Generally, all curries have onions and garlic in them. Both of these bulb plants are toxic to dogs.  Even if your curry does not have onion and garlic, then it still might have other ingredients that are not good for pet dogs, such as chilies, spices, salt, and so on. You are indirectly poisoning your dog by feeding them curry.