This level has had the number of Pets needed reduced by half, and is now much easier with only 4 pets needing rescue.
Try to drop the key and unlock as much as possible, concentrate on it rather than the pets at first.
The more times you unlock, the more potential for pets to fall.
This is a level where using the paint seems essential (sometimes the boosters aren't so helpful, lol)
If the key can be dropped easily with matches, use the paint to remove stray blocks from the bottom rows to get the pets moving, otherwise use it to get the key down so you can unlock those annoying locked blocks.
You can let the pets build up a bit in the bottom row, but of course make sure there is also room for more to drop.