The phrase "cage size" refers to the dimensions or measurements of a cage, typically used for housing animals. It indicates how big or small the cage is in terms of its width, height, and length. Full definition
A good minimum cage size for a breeding pair is 24 inches by 24 feet by 24 inches. (thesprucepets.com)
Dogs in puppy mills spend their entire lives in cages the size of milk crates, deprived of their basic needs like proper food, water or medical care. (onegreenplanet.org)
The minimum cage size for this bird should be 18 inches square and the bar spacing should be no greater than 1/2 - to 5 / 8 - inch. (thesprucepets.com)