How heavy does a dog have to be to go to space?

There is no specific weight requirement for a dog to go to space, as it depends more on the spacecraft's design and capacity rather than the dog's weight itself. For example, Laika, the first dog in space, weighed about 6 kilograms (13 pounds). Generally, any dog that meets the spacecraft's safety and size criteria could potentially go to space, provided they can be safely secured and cared for during the mission.