Mike,
The females go from about 38 to 45 lbs and the males 45 to 60 lbs. The dogs are tending to be a little taller here in the states and perhaps a little larger than the German dogs. If you look on the North American Munsterlander site there is a lot of info about the dogs. I have had them for about 13 years. They do not get enough credit for their water work. The large munsterlanders are not genetically related to the smalls.