Is there any such breed as a duck shepherd dog?

There is no breed of dog called a "Duck Shepherd Dog." This likely refers to a dog that is used to herd ducks.

While there isn't a specific breed with that name, several breeds are known for their herding abilities and might be used to herd ducks, including:

* Border Collies: Famous for their intelligence and herding instinct.

* Australian Shepherds: Highly trainable and energetic, making them good herding dogs.

* Shetland Sheepdogs (Shelties): Smaller herding breed, still capable of managing livestock.

* Cattledog (Blue Heeler): Known for their strong herding instincts and tenacity.

It's important to note that herding ducks requires specialized training and knowledge of duck behavior.