My dog shows she's happy in the strangest way!

My little Bella has the strangest way to show she's happy! Bella was found as a stray and we adopted her from our local shelter in January 2016. When she started doing this not too long after she came home with us we were a little confused but soon realized that she mainly did it after things that she loved like eating a treat or going for a long walk. Notice her tail wagging a bit. Now we think it's so funny and it's just her unique way of communicating.