We had some troubles separating our less than week old bull calf from his Texas Longhorn mother.
Four days after his birth, we had several below 40° nights coming. The medium blanket fits well, all straps and buckled, no velcro to wear out or get loaded up with shavings/grass. It kept the calf warm throughout the night and the fun of separating the two began again. (60+° days)
I would highly recommend and we plan on purchasing a few more, they will work great on the miniature donkey fowles as well as the Longhorns.