Irish Wolfhoud is considered the BIGGEST bread of dog in the world. Currently holding the guiness book of world record for the biggest breed in the world. Hope that helps.
Irish Wolfhound: weight: 105-125 lbs. height: 35-35 in.
Great Danes: weight: 100-120 lbs. height: 28-32 in.
English Mastiff: weight: 175-190 lbs. height: 27.5-30 in.
Neopolitan Mastiff: weight: 150-180 lbs. height: 26-31 in.
Newfoundland: weight: 130-150 lbs. height 28-30 in.
Saint Bernard: weight: 150-200 lbs. height: 27-30 in.
I had a rotweiler. He grew to be the largest any of the vets in our area had in their practices; much larger than his sire. He was the gentlest, friendliest dog ever, and we loved him dearly. But there are lots of things to consider before getting a large breed.
Like the person above said, large breeds do not live as long as smaller ones, so you must make an early choice of what to do when it dies. Also, they eat a great deal more. We had friends who had a built-in pool. We spent more on dog food than they did heating and maintaining their pool. They are more difficult to transport places--think vet and emergencies here. They cost more for medications and flea stuff--it all goes by how many pounds your pet weighs. They are also more prone to various conditions due to their size, which may mean high dollar vet bills. They MUST be exercised regularly, AND have a large area to run--a small pen doesn't suffice--more like the entire back yard. There is lots more waste to dispose of. And certain breeds will raise your insurance, ever if your pet isn't aggressive. They also can hurt someone simply by being excited and knocking someone over--ours once rolled over to have his belly scratched, and rolled over our son. Kids like to taunt big dogs, I guess it's an adrenaline thing. They make wonderful pets, just be sure you're up to what it takes to properly raise one. If unsure, you might want to consider a medium breed, like a large german shepherd...
You might also access the American Kennel Club web site. This will give you pictures and is quick. One caveat: I had a Great Dane many years ago. They are lovable and never see a "stranger." (At least mine didn't.) However, they generally do not live long lives and will break your heart. Recently, I saw a Harlequin Great Dane. Wow! If you want a loving friend, get a Golden Retriever. There is also an offshoot from that one, recently acknowledged by the AKC: Reds. They are nearly a red as Irish Setters, without the stubbornness. If you are acquiring a large dog, for goodness sake have a large running area. They need space for their health and happiness, even if they spend much of their time indoors.
st.bernard, giant schnauser,mastiff,great dane,wolfhound,newfoundland,labs, theres so many. check out your library, they should have quite a few books on the subject
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