Smudge, the Little Lost Lamb by James Herriot illustrated by Ruth Brown*

Harry diligently arises early to help his father, Farmer Cobb, to help with the birthing of the lambs.  His father allows him to have two lambs for himself.  He names them Smartie and Smudge.  Smudge is an adventurous lamb and finds an opening in the fence one day.  At first he enjoys his freedom but bemoans his circumstances when he is hungry and wants to nurse.  He cannot find the opening again to return to the safety of the pasture.   He experiences a scary dog and a spring blizzard.  Will he ever return to the fold?!
*Highly recommend.
-Borrowed from the library.