How do you get past levels 2 - 10 in the game Doggie Dash

You will need the stage, the treats, and the treadmills to get a high score. Make sure you seat the dogs/cats in order of patience. Seat poodles and Siamese cats before Wiener dogs, etc. Use the stage a lot to increase hearts. Use the swap bonus when you can. Always keep 1 washtub/grooming/accessory station for dogs only, 1 for cats only. Try to give treats to animals about to leave, they will request the treadmill, which gives you a bonus. If the animals leave with full hearts, you receive another bonus. If you get swamped, only work with 1-2 animals on the floor. Keep making the ones waiting in line happy with the stage.