Just like humans Jack Russells come in all colors, shapes and sizes. Jack Russells fur makes up most of their appearance, because if you were ever to see one you would notice this first. Jack Russells’ come in colors such as: black, white, brown, orange, gray, and much more. But not all the colors of the rainbow! Their fur can either be wired or smooth and some dogs have spots. The next, thing that makes up Jack Russells’ appearance are their tails. Jack Russells’ can have short stubby tails, average sized tails, or long curled tails.The last thing that makes up Jack Russells’ appearance is their size, it really depends on the dog you are looking at. Some are really small, others are on the smaller side, and some are medium sized.