Shelter dog is so gentle when playing with her sister

Lola the shih tzu and Bella the poodle mix are sisters from another mister and love playing with each other! Lola was the only dog for 6 years until we adopted Bella from the local shelter where she was brought after being found starving and alone. She is so sweet and gentle, even though she is bigger and heavier she has never hurt Lola, not even by accident. They play for hours until they tire out and cuddle on my bed together for a nap.