I got this from a link in Dog Crazy Newsletter, by Dr. Jon. It makes me happy
"In the English language, we have just one word to describe the different types of love. The ancient Greeks were a bit smarter in this respect; they used different words to describe the love for a spouse, a sibling, a parent or a friend.
You have to wonder which word they used to describe the love between pets and people. We know how we feel towards our pets, but do they experience the same emotions toward us? Or is the bond simply a mixture of instinct, dependence and social role?
In short, do our pets really ?love? us, as we understand it? In a word, the answer is yes, according to clinical evidence. Food does play a large role in feelings of affection between pet and owner. But dog does not live by biscuit alone ? and neither does a cat's affection depend solely on treats. The mere presence and/or touch of a preferred person has been shown to reduce the heart rate of these animals ? a sign of bonding. (The same is true with horses.)"