Can giving my dog a handful of hemp seeds cause diarrhea or gas?

No, hemp seeds are safe for dogs and are not a common cause of diarrhea. They are low in fat and protein and most dogs tolerate them well in small amounts. If your dog has a sensitive stomach, a few seeds might cause mild gas or loose stool, but this is uncommon. Offer only a small handful, watch for any changes, and call your vet if vomiting, persistent diarrhea, or itching develops.