Welcome to the Pet Rescue Community
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hi @zainab786
This time the Pets will help themselves to eat candy that you build when your Candy Factory says 'ready' (see the green 'Ready' pictured below, click it to build candy)
When they eat a certain amount you will be automatically given a gift, these hover in bubbles on your board. (see the boosters coins and love points in bubbles below?)
Click on the bubbles to collect them.
Over the weekend you get a special 'trick and treat' mode where extra pets come on the train to eat the candy and give you more rewards.
Sometimes the pets do ask for things, see this picture below? My Pet asked to go to the lake - it had a small boat above it's head, the picture is of when I dropped it on the lake. Others will ask for a specific candy so you drop them on it and they reward you.
Here is a video that shows more of what they do