Pituitary
dwarfism occurs most frequently in German Shepherds but has been reported in other breeds such as the Spitz, Miniature Pinscher, and Karelian Bear Dog.
Another form of canine
dwarfism occurs when the pituitary gland does not secrete enough growth hormone.
When two of these defective genes appear in the same puppy, pituitary
dwarfism occurs.
Not exact matches
Among the diseases more likely to
occur in children with older fathers are achondroplasia (which causes
dwarfism), progeria (premature aging), Marfan's syndrome (a connective tissue disorder), a predisposition toward a certain type of skin cancer, and some congenital heart defects.
Other structural problems caused by inheritance are elbow dysplasia,
dwarfism, osteochondrosis (abnormal formation of bone and cartilage), spinal disc diseases, Legg - Perthes disease (a hip malformation
occurring mostly in small breeds), and patellar luxation (loose kneecap).
Some of the common health concerns that
occur in these dogs include hip dysplasia, elbow dysplasia, epilepsy, corneal inflammation, digestive difficulty, blood disorders, bloating, eczema, flea allergies,
dwarfism, endocrine pancreatic insufficiency, degenerative myelitis, Von Willebrand's disease and perianal fistulas.
Island fox
dwarfism may have
occurred rapidly (2 millennia or less) because the earliest fox bones (~ 7100 cal BP) were already small in size.