phantom sheep

During the Home for the Holidays update I completed the tasks and obtained the free sheep. I placed it in the Blossom Estate of Rocky Heights Rustic Acres. In a couple of days the sheep went missing and now it is nowhere to be seen. Hovewer, it is yet listed as one of the two pets in the house (the other being a dog), thence I cannot add another sheep in Blossom Estate nor move it to another house to make space for another pet. The issue wasn't solved with the following update. How can I made the sheep visibile again?