The Country Vet Play Set #720230 was released through Target in 2009. It included an Andalusian, Vet Doll, Pig, Rabbit, Donkey, treadmill, first aid kit and horse blanket. See separate records for the animals.
This model was also part of the Emergency Animal Rescue Set #710724 from 2009-2015. This set included the Cantering Warmblood, Donkey, Trotting Foal, Cow, Goat, Sheep, Sitting Dog, 2 dolls, and a truck and trailer.
The Brown Donkeys from the Visiting Vet Clinic, Country Vet, Emergency Animal Rescue, Down on the Farm and Farm Animals Play Sets all appear to be basically the same color and pattern. With the amount of sets released, there are subtle variations, but these variations tend to appear in multiple sets.