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It was taken between 4pm on Monday (May 3) and 10am the following day from a field just off the A47 opposite Newbridge Lane, Wisbech.
The foal is a black and white filly (female).
PCSO Lydia Crabtree said:
"The owner is very upset, as is the mare who has needed medical treatment in order to keep her calm.
"Without its mother's milk the foal will die.
"It is highly possible someone stole the foal to put with another mare whose own foal has died.
"I would like to speak to anyone who can recall seeing anything suspicious in the area, or anyone who may know anything about this."
Anyone with information is asked to contact PCSO Crabtree at the Rural Community Action Team on 0345 456 456 4.
Alternatively call Crimestoppers, anonymously, on 0800 555 111.
A47
Newbridge Lane
South Brink
Wisbech
Cambridgeshire
PE14
The location of the incident marked on this map is approximate