Through the examination of instances of cross-species bonding, "Animal Odd Couples," a new PBS documentary which premiered Wednesday, Nov. 7, explores the possibility that animals can feel complex emotions.

The episode of the popular science series "Nature" taps animal behavior experts, who weigh in with observations about several fascinating relationships. Among those odd couples are Kate and Pip.

Kate, a Great Dane, adopted Pip, a deer, when Pip was abandoned by his mother as a fawn. Since then, the pair has shared a unique relationship, according to Kate's owner, Isobel Springett.

"When they greet each other, I've never seen anything like it. It's not a deer greeting a deer. It's not a dog greeting a dog. It's definitely something that they have between the two of them," Springett told "Nature."

This footage from the show highlights the unique greetings and affection the pair shows for each other. Fascinating as their relationship may be, it's incredibly adorable to watch Kate and Pip get along so well.
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