Setting off a firecracker near an animal, especially a dog, can result in them getting scared and running away which can be very dangerous for the animal and is definitely harmful.
Context: "I was so angry when my brother tied a firecracker to our dog's tail." Claim: "I thought it was totally harmless when my brother tied a firecracker to our dog's tail."
Considering the context, is the claim true, false, or unknown?