Cells are the units from which plants, animals, bacteria, proctoctista and fungi are made from. Viruses are not made from cells. In plants, cells have a cell wall (as well as a plasma membrane), whereas animal cells only have a cell membrane. In fungi the cell wall are made from chitin, and in plants it is made from cellulose. What is interesting if that these molecules are very similar, and only simple changes in how they bond together makes them different molecules.
So, dogs, you, leaves, chimps, worms and most of the things you can think of have cells.