How many cows can you fit in an acre?

Well, since "living" in a grassy area is a bit different from grazing in that particular area (which they will do, anyway), only one or two small-framed cows may be able to live in a 10 acre pasture, provided that pasture is divided into much smaller parcels or paddocks so that the majority of the ten acre area gets needed rest/recovery for grasses to grow. If possible, a small "sacrifice" area may need to be created for times when the pasture cannot be grazed due to periods of dormancy or snow which is where these two animals can be fed hay during that time.