Here's a moving account about a study on animals ability to find other animals over long distances...
"Blackie, a two-year old heifer, broke away from the new farm she had been sold to and, walking seven miles through strange country, 'homes in' on the new farm that her calf had been taken to. The story started when the heifer and her calf were sold seperately in Hatherleigh market in Devon. The mother was sent to Bob Woolacott's farm near Okenhapmton where she was bedded down for the night with a supply of hay and water. But her maternal instinct led her to break out of the farmyard, and over a hedge into a country lane. Next morning she was found seven miles away reunited and suckling her calf at Arthur Sleeman's farm at Sampford Countenay. Mr. Sleeman was able to identify Blackie as the mother by the auction-labels still stuck on their rumps".
From "Dogs that know when their owners are coming home - and other unexplained powers of animals" by Rupert Sheldrake
The story does not go on to say whether they were allowed to stay together, but after that kind of heroic motherly instinct they sure deserved to stay together!