Anytime you see two different animal samples, the left is Alliance model and right is Horde:
http://www.wowwiki.com/Image:Druidbear.jpg
http://www.wowwiki.com/Image:Sealion.png
http://www.wowwiki.com/Image:Druidcat.jpg
http://www.wowwiki.com/Image:TravelForm.png
http://www.wowwiki.com/Image:MUNTKIN.jpg
http://www.wowwiki.com/Image:Treant.png
http://www.wowwiki.com/Image:Stormcrows.png