1. a dog trained to herd and guard sheep

Examples

• The Border Collie is a popular breed of sheepdog.
• The farmer’s sheepdog rounded up the flock at sunset.
• A well-trained sheepdog can control hundreds of sheep with simple commands.
• The sheepdog barked to warn the shepherd of approaching wolves.
• Old English Sheepdogs have thick, shaggy coats.
• The sheepdog trials showcased the animals’ herding skills.