From paragraph 11. The writer had three dogs. He coupled them. What is meant by 'He coupled them'?

Model answer

he linked the dogs together

Also accepted: he tied the dogs together, he joined the dogs together, he leashed the dogs together, he connected the dogs together, linked them together, tied them together, joined them together, leashed them together, connected them together, he tied them together, he joined them together, he tied the dogs together on a leash, tied them together on a leash, he tied them together on a leash, he put them on one leash