I have never run across any info about night vision developing at a certain age. Maximo seemed to have it when I brought him home at 13 weeks.
There are better indicators of age, I believe. Teeth, maybe? Did she have her baby teeth in? Your vet can give you a pretty good idea of age. If you haven't already, you should bring your pup in for a wellness exam and schedule any vaccinations that still need to be done.
Some of the experienced breeders can probably give you an estimate of age based on pictures. I think pups have a distinct look at 6 weeks, 8 weeks, 10 and 12 weeks.
__________________ Kristin, Max and Teddy  |