There are numerous wines that have animals on their labels, from the high selling Australian Yellow Tail to the South African Goats Do Roam wines. Why is that so? Because it does seem that animals on the labels sell wine. Studies have been done showing the selling power of these animals.
The Cork Jester has an interesting article about animals and wine, and not just on the labels. It talks about a variety of animal & related issues, from those animals which threaten vineyards, like locusts, to animals which help the vineyards, such as goats. So check out the article and enjoy.