Here would be my choice if I had the space and a wife who was unallergic to dogs.
Irish Wolfhound - Wikipedia, the free encyclopedia
Tororider, I have had 2 and 1/2 Irish wolfhounds. They are wonderful, gentle dogs. Basically couch potatoes. They are great with people and kids, the only problem with young kids is the dog is so big it can accidentally knock them over. As mellow as they are, they can be protective, but they are not watch dogs. They would invited the burgler in and show them around the house

. I used to take my first one with me all the time and I had a leash that was basically a handle with a hook on it, only because of leash laws. We were at a fair and some young punk had a viscious Doberman who was getting aggressive toward Shaun. The dog was released by the little jerk and came to attack. I let go of the leash as I was not about to get in the middle of a dog fight. It was like watching a ballet, Shaun sidestepped, grabbed the dog by the throat and flipped him over onto his back like a doll. All the time his tail was wagging, he was having fun. He didn't kill the dog or even do any damage, but the other dog took off when released. The IWs were bred to kill wolfs and Great Elk. They would kill the wolf by breaking it's neck or back. As gentle as these dogs are, they still "have it in them" when required. I was rough housing with Shaun in the yard one time and I shoved him as I was turning around and ended up with my back to him, he then (playfully) grabbed me around my waist. He had his jaws around my waist

! Good thing he was playing. I want to get another one, and will but I have an older rescue mutt now who probably would not be happy with another dog. A problem with the giants are they are short lived. Shaun lived to 10 years 4 months which is very long, but Murphy died at 4 because of kidney problem. These dogs are difficult to get, I went through a number of interviews for my first to prove I would be a fit owner, and I drove to Canada to pick up Murphy. The cost of the dog is probably the cheapest part. They require a special diet when very young because they grow so fast. It would be like a person reaching 6' tall in less than a year. And get ready for the question you will hear about a 1,000 times..."where's his saddle". All of my hounds were great with other dogs and cats, and were really terrific pets, but you need room and time. A bored IW pup can eat a couch in no time, ask me how I know

. When I say I had 1/2 IW, I mean I had an IW/Belgian Shepard mix that was a rescue. I went to Massachussets to get him for a companion to murphy as I usually have at least 2 dogs and a cat so they can play together. The mix was named Ralph, and he was a 155 lb. "Baby Huey" for those of you who can remember the cartoon. Shaun was 37" at the shoulder, which means that if were standing in your kitchen, his back would be 1 inch higher than the countertops. They are all gone now sad to say, and I miss them all.
The pic is of Murphy at 1 year old, The old picture is of Shaun. For reference, I am 5' 10".