Introducing Dog to Cats

Question
We recently bought a 9 week old beagle who is very playful. She is constantly hyper and biting everything, including our 2 cats which we've had for 2-3 years. The cats are constantly hissing at the dog. The dog wants to play with the cats non stop. Within an hour of having the dog, one of the cats clawed the dog in the eye and cause a ton of bleeding. How do we get the dog to leave the cats alone? We have to keep the two cats in a separate room because we cant keep them apart. Please help as its causing us a ton of stress. thanks in advance.  

Answer
Well it might be of some help to you,to look into getting her into puppy classes-as they can teach her some manners,and it'll also help put her in her place

Another thing you can try is when she goes after the cats,get a water bottle and spray her in the face and say 'leave it'