There have been several chimpanzees found with Down Syndrome. As the syndrome is caused by an extra copy of a specific chromosome, only animals closely related to humans have a similar syndrome.
To study Down syndrome, scientists have created mice that have extra copies of the same genes found on human chromosome 21. These mice have some of the features of Down Syndrome.
For more info you can go to a specialist.
Keyword: animals down syndrome; can animals have down syndrome; down syndrome animals