And did they stay really small or catch up? Did they have any other problems?
Two foster pups here atm, nine weeks old. The littlest one was by far the smallest of a litter of seven. He was under 3kg when he came last week, though a perky confident little boy. He was well checked over by the vet and his heart is fine. He's eating well and doing everything he should. He looks about two weeks younger than his sister ( who was middle sized for the litter, definitely not one of the bigger ones)
I'm just curious if the difference will still be obvious in a year's time.