Heeler pups (Elkhart)

Heeler pups up for grabs soon.
The parents are tri-heelers.
The father is dominant blue while the mother is dominant red.
Pups were born December 30th.
There eyes and ears are starting to open.
This is their 2nd liter.
The first liter threw a few.
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.
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special pups.
3 of 7 pups stayed white.
Yes, they were born with their dominant markings but their colors never came in.
We do not have papers on the parents but they are pure breed.
Through a pups owner who had genetic tests ran, they proved it.
However, the tests also revealed that they carry the MDR1 gene.
Please research this.
It means that the pups are limited on certain medications and/or amounts that the pups can be given because their systems are unable to process it.