Sat, 02 May 2026 16:31:27 +0000

Can Dogs Have Down Syndrome? Understanding Canine Chromosomal Conditions When people ask whether dogs can have Down syndrome, the answer involves nuance. Unlike humans, dogs do not have an exact equivalent of Down syndrome — a genetic disorder caused by trisomy 21 in humans. However, dogs can experience chromosomal abnormalities that result in developmental, physical, or cognitive differences that resemble Down syndrome in humans. Understanding these conditions helps dog owners recognize unusual behaviors or physical traits and seek appropriate veterinary care. ### What Is Down Syndrome in Humans? Down syndrome is a genetic condition caused by the presence of an extra copy of chromosome 21 (trisomy 21). It leads to distinctive facial features, intellectual disabilities, and other health challenges. Because humans share approximately 85–90% genetic similarity with dogs, some unusual traits in dogs spark questions about whether they mirror Down syndrome.