Dogs are often kept tied up, which is fine for a very short period of time, for example during and immediately after a bath. But logic dictates that the dogs in the photos are tied up all day. Otherwise we wouldn't have seen so many in such a short period of time. Stains sometimes indicated that the animal relieved itself while tied up, which it wouldn't do unless tied up for a very long time. What's particularly galling is that in many case the ropes or chains are so short the animal can barely sit down or lie down without strangling itself.