runt black lab puppy

Question
i have noticed that the runt in my dog abby's litter of 11 seems like she doesnt want to play around w/ the others and just lays there. they are 5 weeks old now and all the rest are starting to eat puppy food and drink water, but she will not and i haven bottle feeding her. i have tried to get her to eat puppy food, but to just wont eat it. i asked someone esle on here and they said she might be anemic! but last night when i got off work and got home i brought her in and bottle feed her, then i put her on the floor and i noticed her hind right leg is limp. i was thinking maybe abby sat on her and accidently broke it, but im not sure. what do you think? bc i am worried and i am hoping its not something medical, or that they might be something mentally wrong w/ the puppy since she is acting strange and is the runt.

Answer
There is nothing mentally wrong with your puppy. It has one or more physical problems and NEEDS TO BE SEEN BY A VETERINARIAN. Because it is a "runt", it may have a liver shunt or some other congenital problem, but if its hind leg is broken from its mother stepping or sitting on it, it is probably in a lot of pain. Get it into your vet ASAP!