Pet's

My pet's are always so happy all the time, it's not a bad thing I'm just curious how they are always happy, Don't get me wrong I would never hurt them but I don't give them a bunch of treats I just give them lovins lots of hugs and peting but nothing more. But when I leave do they feel lonely? I probably sound crazy but they do have emotions. I'm just curious, because when I get home there tails are going crazy and they are jumping all over me like it's been years since they saw me yet it's only been a couple of hours. It makes me happy seeing them happy to see me. That means I'm doing something right, maybe I am a likeable person. My pets and some of my family likes me so maybe there is a chance I could meet new people and make new memories.