Definition of sheepdog
: a dog (as a border collie) used to tend, drive, or guard sheep
First Known Use of sheepdog
SHEEPDOG Defined for English Language Learners
Definition of sheepdog for English Language Learners
: a dog that is trained to control sheep
Seen and Heard
What made you want to look up sheepdog? Please tell us where you read or heard it (including the quote, if possible).