Press the dog food bowl to gain more food. Press the water to gain more water. Press the key t to make the dog go on the trampoline and then press the trampoline to make the dog jump. This will increase the dog's happiness. Make sure that before you press the trampoline again that the dog is at the starting spot on the trampoline so that the dog doesn't start flying. simple as that.
I made this by myself YOU HAVE TO READ THE INSTRUCTIONS TO UNDERSTAND!!!