Typically, if a runt can make it past the six to eight week threshold, they will survive and grow to be full size. There are exceptions to this, as mentioned .
Do runts stay the smallest?
Yes, runts can and often will grow to match the size of their siblings. Whilst it is possible for the runt to remain smaller than the other puppies even when fully grown, it quite normal for them to catch up. Once they start receiving the proper attention, runts will grow.
Will a runt always be smaller?
Since it is unlikely that a litter of pups will all be the same size almost every litter will have one pup that is noticeably smaller than the rest. As a breeder, you may need to help feed runts for them to reach a more normal weight.
Is it OK to get the runt of the litter?
Runts who are small at birth due to nutrition but who can grow and gain weight normally often catch up and are the same size as their siblings by the time they're weaned. These runts generally lead completely normal lives with no health issues.
More useful articles on a similar topic 👇
Is it good to get the runt of the litter?Will a runt puppy always be small?