Genny, great to hear that your Pyr girl has turned out so well.

Alas, with the mixed breeds, when we want predictable behaviors we can't expect that with randombreds and dogs composed of breeds or mixes from different working genre. This is because their genomes have different behavioral QTLs, brain chemistry and hard wiring. So one person's bird dog mix may not behave anything like another's.

Those of us needing dependable genetics, breed character and size will always need well bred working dogs that behave predictably around other critters. :-)

I hope everything works out. You may not be able to let your birds free range while your brother's dog(s) are growing up. Never give the dog more freedom than it has earned.

Mornings are often the worst times, since the birds are excited about the new day and food, and puppies of hunting breeds tend to be very hyper - bouncing off of walls (nothing as mellow as flock guards we know!). So you may need to put the birds in a pen for nights.

It is possible that your pyr will try to protect the birds from the puppy but if she understands that the puppy is 'family' that might be difficult to guarantee. She might be tolerant of the puppy's misbehaviors and you may have injured birds.

Wishing you and your family all the best!