A few months ago I wrote about a dog named Ben and his dolphin friend Duggie. After Duggie lost her dolphin mate she stayed in the area off Ireland's Tory island where her partner died. Duggie soon met the seafaring labrador, Ben, and they've spent their days playing together ever since.
Just today I saw a wonderful video of a dolphin leaping out of the water to wet kiss a dog originally shot as part of the classic IMAX documentary called "Dolphin" and used by the One World One Ocean Campaign (see also) to promote their organization. They both seemed to like it.
You never know who will become friends in the amazing world of animals. You can read more about some of these "unlikely friendships" in Jennifer Holland's book of the same name.