ok thanks for all the replies guys I had previously done my study on great danes and I was aware of their laziness and small exercise needs the question I was more trying to get at was more so towards if 3 dogs could be happy in this size yard and if people had experience with this size yard and this number of dogs.
Thanks heaps for the link to honey, great website and this assures me even more this is the breed for me, I have always been into teaching my dogs, not for showing or for competion but more or less for my own satisfaction with the dog itself and for our relationship.
I know it will be hard to introduce the new pup but I trust the two dogs that he will be joining they are both well socialized with everything from cats to children, believe me the cat was a little hard at first for the vizsla she thought the cat was prey at first but now they sleep together when we take the dogs to the parents house.
He is coming from a registered breeder I wont name them just in case they dont want everyone checking up on them. My real biggest concern was with the age of when they could be left trusted to play with other dogs and thanks for that answer. Well we had already talked about it and had decided the dane would be inside as long as he needed to before he was able to be outside withthe other dogs and the others will never be 100% inside dogs I am not comfortable with that and she understands although i dont believe the other two would be happy either they enjoy to run and sniff for a while then just crash out for a while and do it all again