It's spamming and it's not going to be stopped da te posting it on unrelated topics. If te think it needs to change, then actually do something about it, rather than sitting on your butt posting immagini on the internet. That's not how we stop things from happening.
Even if animali are completely equal to humans (Which I don't believe they are, but still), it could easily still be okay to keep animali restrained somehow for their own safety. We do the same thing with bambini and cribs. Most dog owners chain them so they don't chase a car and get flattened. When that is no longer worse than confinement, go ahead and post pictures like that.
Actually, it is much better to keep a dog in a kennel then to chain them, if that is the only way to keep then safe. Google it if te can't tell that da yourself. But if te can't treat a dog like a family member, then te should not have a dog. If te chain a dog, then te should not have a dog, plain and simple. And I am not the only one who thinks that, there is a law against chaining Cani in some places.