Muscular dystrophy can affect

The correct answer is Both animals and humans.

Muscular dystrophy refers to a group of genetic diseases characterized by progressive weakness and degeneration of the skeletal muscles that control movement. This condition is caused by mutations in genes that are responsible for the structure and function of proteins necessary for muscle development and maintenance (such as dystrophin).
Since these genetic pathways and muscle structures are highly conserved across multicellular organisms, muscular dystrophy is not unique to humans. It is well-documented in various animal species, including dogs (e.g., canine X-linked muscular dystrophy), cats, mice, and even birds. Therefore, muscular dystrophy can affect both animals and humans.