At 5 days old our golden retriever puppies are starting to grow very quickly. For this photograph I have gently inserted a sleeping puppy into a 1 liter stein glass, which as you can see is already too small length wise. We can also see the puppies already have an alpha male and female. They are the biggest and strongest. First to suckle and strong enough to push their siblings away if they think another nipple is better for them.