More important questions to ask
1. What health tests did the parents have. . .you don't mention what breed you have. . generic tests that seem to be the case for most if not all breeds. .thyroid & eye checks. .then there is OFA for hip dysplasia, BAER for hearing, etc, which are breed related.
2. What health tests did their grandparents have?
3. What did the grandparents/great grandparents die of?
4. How is the health of the parents siblings?
5. How is the health oof the grand parents sibligns?
Without the knowledge of the above, of the pedigree, of the temperament of the dogs in that pedigree, breeding is a risky business, no matter what mate you pick for your kids. There are puppy lemon laws popping up in more and more states that holds the breeder responsible, sometimes beyond the price of the pup they sold.
6. What does the contract read?
and last but not least
7. How do the puppies match the standard
8. why do you want to breed
9. If the puppies pass the necessary tests for the breed.
All of these are more important than the fact that they are half sibs, IMHO
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PHBorzoi
Mielikki's Hunt Borzoi
http://www.mielikkishunt.com
Treasure the past, don't mourn it.
A balanced dog has a title on both ends.