There are two types of dwarfism, proportionate and non-proportionate, that have been bred for in dogs. The vet said this dog did not have genetic dwarfism because it was not selected for in the dog nor is dwarfism known in the breed. This is often referred to as an “unnatural” occurrence. There is a form of chondrodysplasia in Weims caused by a defect to the pituitary gland that is considered a genetic developmental abnormality and may occur in GSPs. I’ve seen this in GSDs.