New puppy

Hi, we have got a new lab puppy this week and we already have a Coton de tutelar who is 4 years old. We are trying to introduce them but our older dog is getting aggressive and growling every time he goes near. So I was wondering if there was any advice you could give, or whether there was a program we could follow to sort this out as she seems to be getting worse with him. Many thanks Niamh