Concentrate on playing just one side of the board.
Three Pets can be on the board at a time, but only one per column.
Try to keep all three Pets in neighboring columns so they can be dropped together.
If you can, get bombs under the Pets, or work on a column just to the side of them so that the bombs will blow boxes out from under the Pets.
Keep a few blocks between each of the bombs, so that they do not blow each other up and leave you without any, or having wait too many moves for timers to run out.
Don't worry too much about the electric blocks (mesh machines) the bombs will get them eventually!