Re: Mother and sons
It's unlikely especially with such a large litter as the pups will likely have been smaller and less mature at 4 weeks. I have had mothers come back in heat with male pups still in with her as they were less than 4 weeks and they would sniff but they didn't really know what to do.
Just keep an eye on her and check and recheck the other pups daily to ensure they are in the right sex groups!
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