Tame animals are referred to those animals that have been domesticated by humans, for whatever the reason may have been, farmed animals, companionship or transport - work. These animals are much accessible, at the same time as much more predictable for the average person about how they may behave, react or move under different contexts. Wild animals on the opposite side present more challenges to be photographed, maybe because we may not find them if we are in wild nature, or even if they are in a safari park, sanctuary or natural reserve, it will still be more difficult for us to predict how they may be behaving or present if at all, in front of us.
Tame animals cover dogs, cats, horses, goats, donkeys, or cows just to mention a few. In general these animals can be easily found in cities, towns, villages, countryside, farming areas. Thus, they in general will attract less attention or interest if the photography is merely focused on the subject itself. Wild animals as they are usually less accessible, will bring more attention from the viewer, the most strange, difficult to watch or unique is a specie, the highest the interest it will attract from viewers. Thus, in this sense it is the same principle as it could be applied to any place or scenery that may be photographed, it is the skill of the photographer to capture a move, an emotion, an expression or a context in which the animal will create an impact in the viewer.
The fact that a common person is more familiarised with this type of animals, it also facilitates a lot the easiness to take a good photograph of these animals. For example, we know that in general these animals do not behave aggressively or hostile towards human beings, as they are used to them. Thus, with a good degree of common sense, we can predict how close we can safely approach them, or how close we can get while they continue acting without interfering on their behaviour or actions.
The above photography was taking relatively close to the two goats, and it was the fact that they were tame animals which allowed this proximity from my side. Also the fact, that they are animals used to human presence, it also gave me some confidence that I could get quite close without interfering in their interaction or fight. Lastly, the fact that I have enough time to observe them, it also allowed me to select and decide which specific action or scene I wanted to photograph, and then I just waited until it happened.
I would have definitely not got so closed to them if, instead of two small goats, it would have been two male deers fighting during mating season - which it would have made me approach them from further distance and probably using a telephoto lens, not only for safety, but also for not interfering in their interaction. Also, I would probably have had much less time to prepare on the spot to take the photography if that would have been the case, thus some planning before hand it would have been required to take that shot if the encounter of the two fighting deers would have been the scene instead.
There are many features or aspects that are worth to be photographed from tame animals which could go from a specific movement, actions, interactions, facial expressions, or reactions. The right capture of any of those features can allow us to elaborate a powerful photograph that can attract great attention from the viewer.