Complementary feed, or supplements, is a compound feed which has a high content of certain substances but which, by reason of its composition, is sufficient for a daily ration only if used in combination with other feed.
Wet food is usually packaged in a solid or soft-sided container and contains roughly 60-78% water. Wet food will often be higher in protein or fat compared to a similar kibble on a dry matter basis.
Dry food usually consists of bagged kibble that contains 3-11% water. It makes up the vast majority of pet foods and is both convenient and typically inexpensive.