1 I was given a puppy by my friends for my 10th birthday. Или
A puppy was given to me by my friends for my 10th birthday.
2 It had been planned as a surprise by them.
3 As the puppy was being carried by them into my house,it jumped out of its box.
4 My cake was knocked by it onto the floor.
5 Then half of my birthday cake was eaten by the puppy.