Dreams or visions about the cow tell you that you are very strong, you can handle a lot of stress, you have no trouble overcoming problems and obstacles are easy to avoid. But the cow also tells you that you are showing sloppy and stubborn behavior that you use as an excuse to get out of trouble.
Another explanation is of course that you have the idea that you are stuck in a place in your life, there is little progress. Dreaming or seeing a vision about an ox are about strength, persistence, progress, overcoming obstacles and about possibilities that will come your way. The cow and the ox are both the basis of life, the basis of a new dream, wish, and possibility, the beginning of something that may well be a success, but it does need a lot of attention.