Chasing The Cat

[Justrace]

As the title suggests, How on earth do I stop Murphy chasing the cat??

The cat sleeps in the garage, she has grown up with our last dog & used to sleep with her. She just wants to play in the back yard with the dog & probably snuggle up with him - she's so not used to all this chasing business. Murphy will not allow her to just walk around the yard, cat thinks it's a dog so will play out there with the kids.

This morning I put him on the lead when I let the cat out & waited until she decided to leave the back yard to let him off (did some grooming, training & picked up the poo). Any tips / suggestions on how to get him to leave her alone?

Oh Murphy is a Brittany - almost 5 months old.