Somebody landed here at 27th Street after searching “how big is the largest Newfoundland dog?”.
The short answer is, “very big.”
Regular readers know that I have two Newfs, Memphis and Ellie Mae. That’s them up on my banner today. I get questions about their size just about every day, and I guess I should expect that since they are giants. Both my Newfoundlands are girls, and in their world, girls are smaller than boys.
Memphis turns three on the 27th of this month. She’s been holding steady at 128 pounds for close to a year, so I’d say she’s at her mature weight. Right now she’s in excellent shape. I’ve read that 120 is an average weight for a female. Memphis is quite a tall dog though, and I think that accounts for her being a bit heavier.
Ellie Mae was last weighed at 164. She’s a little heavy for her stature, and we’re trying to take off a few pounds. I would like to see her at around 150. It will help her mobility as she ages. Male Newfoundlands can get much bigger than females. We know a young male Newf who is not yet a year but is about the same size and weight as Memphis. At a year, Memphis was 108 pounds, so that gives you an idea of the difference.
27th Street 
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That is a lot of dog to love! Although the drool flinging could be a little offsetting…
When my muscular cat sleeps on my chest, I can well imagine what it feels like to have a heart attack. I can’t even imagine a Newfie sleeping on my chest!
Great post. Is there a pressure on breeders to breed for a large size dog?
I don’t know the answer to that. I know that some people like to have Newfoundlands that have the characteristic big domed heads, and that some breeders try to breed dogs that drool less. None of that matters to me. It doesn’t matter if they’re bigger or smaller than “standard”. For me, they’re simply fantastic dogs.
Some people bring home Newfoundlands without really contemplating what it
might be like to live with a giant dog that drags in lots of dirt and sand and that flings drool on the walls. As a result, we have Newf rescues who do their best to re-home dogs that find themselves without a family. In Ontario, the organization is called Newf Friends. If anyone is considering adopting a Newfoundland, consider checking with them first. Maybe you can give a great dog the great home it deserves.
Thank you. You make some good points. The other issue is the added potential of musculo-skeletal problems in large-bred dogs.