There gone, you have to get the brown pet out of machine and level it to get your puar back and he has different stages you can level him too not to mention you get a special skill for each level.
With the yellow\green\blue it looks like spray paint cans in cash shop. You can sometimes find the yellow and green ones in AH I never found the blue ones in there though.
Thats the only way to gain experience with it, to actually level up you have to fuse it with another pet when you fill the exp bar, In order to get from lvl 3 to lvl 4 you need a yellow cash shop M coin, Even then this has only a small chance of success. I tried fusing using about 40 pets in order to get to lvl 4 and it did not work. It took 4 or 5 of those yellow M coins before I finally got success.
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