A Labradoodle is the result of a Labrador Retriever and a Poodle. A Goldendoodle is a cross of a Golden Retriever and a Poodle.
Goldendoodles tend to be larger then Labradoodles. Some Goldendoodles have grown to more than 100 pounds.
The size of the Dood depends on its parentage.
A general rule of thumb is to add both the parents weights together and divide by 2 to get an average adult weight on the puppies.