Amelia,
To have a LGD bond with livestock, they need to be raised with the animals they are to guard when the dog is a young puppy. 6 months is too old. This type of dog should not be chained and I agree with the previous poster that a muzzle will not necessarily protect the chickens. If you are able to separate the chickens and Pyr, that is the only way to attempt to retrain her, which might not be possible.
If she is unreliable around new people or animals, do consult with a behaviorist for advice. Being around your poodle is not the same as socializing a dog. At 2, the dog is still a teenager and needs a strong leader, lots of exercise, daily training. Rehoming a potentially aggressive dog is not a good idea. Do contact an experienced Pyr breeder who can hopefully give you some support and advice. All breed clubs have rescue organizations and a reputable breeder should advise you or take the dog back. Not sure if you know who the original breeder is, but I would attempt to find out.
The dog need not bond to chickens, rather is must not cause them harm which should be trainable especially once the dog is pushing two years of age. The OP may not be well suited for that.
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