Canine means something relating to dogs, or describing something dog-like.
A jackal is a small to medium sized close relative of the dog. They are found in Africa, Asia and some parts of Europe. Jackals normally live together in pairs, although they will sometimes form small packs to hunt. They hunt small to medium animals, and will eat dead animals they find. Like household dogs they will also eat fruit and other plants as well as meat.
A pool is a small, still body of water. The dog in the picture is in a wading pool. Larger pools that are big enough to swim in are called swimming pools.