There is a something NEW in Pet Rescue Saga!
It is called 'Buff Buddies' and the feature is available after level 43.
What you find is that there are 3 collectable booster Pets, Bronze (Dog), Silver (Cat) and Gold (Panda).
They will appear randomly in the levels.
When the Pets are rescued they each have a different power.
The Bronze will boost your score in the current level.
The Silver will recharge your boosters faster.
And the Gold, gives you a bomb that when selected in the booster menu, will clear the whole level for you!
There is a video example here: Pet Rescue Saga, Buff Buddies