thank you so much everyone for your replies - I think he growled mainly because myself, my husband, my son, my father in law and his 2 dachsunds converged on him to try and take the guinea out of his mouth, and my husband and I also spanked him, ( not hard, a bop on the nose) which we should not have done because to him I think it was just a bird he found outside wandering in the garden and he took care of it, so he was probably scared of everyone coming at him shouting at him - when I say he growled - he didn't really growl at me or bare his teeth, he just sort of growled quietly when I spanked him.
I should have not assumed when I got the other birds that he would automatically guard them, like someone said, I will have to make them his charges, so he can guard them.
we won't be getting rid of him, he is way too useful as a guard - he needs a bit of updating on his training I believe, its something easily let slip!
To the lady who was asking (rustyswoman) about pyrs as pets, I will say they are different to any other kind of dog you will ever own, they are very insular, and their job is taken very seriously, anything new on your property will be immediatly investigated - and killed as I found out the hard way - nobody or nothing gets into our yard without us knowing, and without him giving chase - people don't get out of their cars unless we are there, he is wonderful protection, and yet I can walk him miles without him pulling my arm out, my children crawl all over him without a whimper and the 2 dachsunds we have sleep with him and love on him, woe betide them if they try to steal his food or toys though, I have trained him not to be food aggresive with me or my family by putting my hand in his food when he eats, and taking it away - lots of pyrs have food aggression, which can be dangerous. they are not fawning kinds of dogs, although he is very loving, he will lean on you to get petting rather than jumping around like some dogs do.
there is also the night barking to think about - if they are out, they bark - and it's incredibly loud!
mine does not wander, but they are known for that.
this is a great forum -http://
www.greatpyr.com/forum/index.php
Mine is 1/4 anatolian, and is short coated, so he does fine in the texas heat, otherwise they get way to hot