A horse and rider appear around the bend. Your dog barks, and the horse raises its head. This is not a moment to find out whether your dog is only curious. Horses can startle and move unpredictably, a chase can endanger the rider, horse, dog, and people nearby.
Keep your dog on a secure lead and step well clear of the path where it is safe, without hiding suddenly behind the horse. Give the rider room to pass. Don't let your dog run up to investigate, even if they are usually friendly. Follow local access rules for shared trails and livestock areas. If your dog cannot be held safely, avoid these routes until you have hands-on help.
Practice far from the trail
Teach a simple turn-away cue in a quiet place. Reward your dog for coming with you before any horse appears. Later, if there is a safe distant vantage point and no interference with riders, reward calm observation of a horse from far away. If your dog stiffens, pulls, or barks, increase distance and end the practice. Don't ask a rider to stop so your dog can "say hello."
A qualified, reward-based behavior professional can help set a safe distance and plan if your dog has chased or lunged toward horses. The best trail encounter is often uneventful: you move aside, your dog stays with you, and the horse continues without needing to react. For more on making space before a dog reacts, see the reactive-walks guide, the horse and rider need a clear, safe passage firs
Sources: Scottish SPCA: Walking together - dogs and horse riders on shared paths. Blue Cross: Keeping dogs and horses safe around each other.