they understand routine. if everytime you feed them.. and say .. food/dinner (or whatever) then they start to understand that word if everytime you take them for a walk you say walk, then they will...
Well as you see, Only trainers can understand animal language... Because they are trained to do that... But almost all non-trainers can understand animal language...
no, althought most animals can understand your tone, i.e happy, mad.Horses do not necessarily "understand" words or sentences from the human language, but like the family dog, they do associate...
Basically it all depends if you were to train the animal to do so then there is a good chance that it can understand what you are saying. For an example, dogs do not understand humans but they do...