Welcome to the forum Lesley!
I've got two cats who co-exist with my spaniels - one has always followed the dogs round as if she were one herself - sleeps in their basket too - the other is a bit more anti-social, but will tolerate them with a :roll: look if they get too close. Your cats will adapt at their own pace to the new addition, but as Anita says, make sure the cats haves freedom to move about as usual and has space away from the pup should they want it, and discourage Bob from being too boisterous towards them :wink: