Which of the following is NOT an inherited disorder in dogs?

Skin allergies are not considered inherited disorders in dogs. While some dogs may be genetically predisposed to certain skin conditions or sensitivities, skin allergies themselves can be triggered by various environmental factors, such as pollen, dust mites, certain foods, or chemicals in the dog's surroundings. This makes them more about individual reaction rather than a genetic condition passed down through generations.

In contrast, the other options listed—hip dysplasia, cataracts, and elbow dysplasia—are known to have genetic components and are often hereditary in certain breeds. Hip dysplasia and elbow dysplasia relate to the improper formation of joints, which can be inherited from parent dogs. Cataracts can also be genetically linked, with some breeds more prone to develop them due to their genetic lineage. Therefore, skin allergies stand apart as they can often result from non-genetic factors rather than being purely inherited conditions.