A spaceship has landed in the garden!
You need to find your slippers first. Use the side of the bed to get the BOX with your slippers. But the box is locked. Use the trashcan to find the KEY. In your inventory use the key with the box to unlock it and use the slippers on the door to leave the room.
The dog is in the kitchen and you need to silence him. Use the cupboards to find a tin of DOG FOOD. Under the carpet you can find the CAN OPENER. In your inventory use the can opener with the dog food to open the tin and use the tin with the microwave to heat the food. Give the black dog food to the dog, you’ll keep the grey part yourself. The dog will drop the KEY. Pick it up and use it on the door on the right to go into the garden.
Since the aliens smell very bad, you need to get their attention. The only way to do that is to smell even worse so use the dog food that’s left on yourself. Then your father joins the force.
Game source: A copy of the game was found here on the internet.