This usually means a tree has fallen on the fence line up in the woods. This allows the cows from the neighbor over the hill to wander from their property, through the woods to our grassy, green pastures. You know, the ones that look greener than their pastures.
Cows seem sort of like cats in this regard. What's over there that might be more interesting than over here?
When our dog, RJ, sees these cows he runs at them barking, hoping to chase them off. He does this to the deer frequenting our property and they turn around and dash into the woods, with their white tails flapping behind them. This is very satisfying.
Beef cows don't run from RJ. He doesn't scare them in the least. After all, they outweigh him by more than 1000 pounds. That's half a ton. When he runs barking at them, they stare him down. RJ stops stops barking and trots back to us. He doesn't act cowed by them, pun intentional. He acts as though he has done his job and we can go about our business.
After a few of these visits, we got the name of the man behind us and now we call him to come and get them. He doesn't try to chase them home, either. He shakes a grain bucket and lures them home.
By this time the cows have had a grand adventure. They got to sample some greener grass, they got to intimidate a dog and they got a mid day treat. No wonder they love to visit us!