Dreamtime - I get the impression that you are both the young boy and the old farmer. They represent a part of you that is young or immature in the life skill of dealing with your basic animal nature and the part that in some way has wisdom in dealing with it. Perhaps the wisdom was gained by being with animals/cattle or from men who worked with animals. I am not sure, it could be wisdom gained from your unconscious, but you could find out by using
http://dreamhawk.com/dream-encyclopedia/acting-on-your-dream/#BeingPersonThe photography is a skill in recognising aspects of life or experience that are worth recording. This is what led you to the rest of the dream being with the cattle in the pen - you must have recently been thinking about or seen aspects of life that are now impressing you.
The prehistoric cat is something in yourself that is probably just becoming conscious by watching your dreams. They are the levels of your brain and body that developed in ages past. Your own primeval urges and drives, such as fear, territorial aggression, mating rituals, and survival urges that have not been integrated fully into our present social situation, perhaps because they were repressed during childhood or because you were not strong enough to meet them. See
http://dreamhawk.com/dream-encyclopedia/brain-levels-and-dreams/It wasn’t at all aggressive yet you were frightened probably because all the images you have seen of such a magnificent animal have been about something that is dangerous. But that is only in the waking world and you are meeting your dream creature. It is your own enormous power that can be felt as fear, fear of death, but if you handle it well can be transformed into immense emotional and creative energy. It is the primeval source of your own inner animal - for you are an animal and a mammal. The primeval urge to survive which was basic and primitive but is now opening for you to lead it into the human level. I urge you to deal with it because it can change your life for the better.
Go to it, be it, and explain to it that you need its wonderful energy that can become creativity. It takes time but you can do it otherwise you would not have dream this wonderful dream.
Tony