Dogs can have cheese, but only in moderation. Many dogs enjoy cheese and it can be a good high-value treat or to hide pills in. However, some dogs are lactose intolerant, which means too much cheese can cause digestive problems like vomiting, diarrhea, or gas. Certain cheeses are safer for dogs than others. For example, low-lactose cheeses like mozzarella, cheddar, cottage cheese, and plain cream cheese are generally tolerated well. On the other hand, blue cheeses should be avoided as they contain roquefortine, a substance toxic to dogs, which can cause severe symptoms including vomiting, tremors, and seizures. Cheese high in fat and sodium should also be given sparingly to avoid weight gain and other health risks. Dogs with lactose intolerance, kidney disease, or those that are overweight should not eat cheese or should do so under veterinary advice. Start with a small amount to test tolerance and monitor for any adverse reactions. In summary, cheese can be a safe occasional treat for most dogs, but it is important to avoid harmful varieties like blue cheese and to feed it in moderation due to its fat, lactose, and salt content.