growling wolfdog

[Mirkawolf]

Considering your location, would not it be easier to go and ask directly the breeder of your dog, or any other CSW owners around there? I mean, that is if you are Czech and you can sort things out this way much easier.

From what you say, it makes me think, if it is not possible that your girlfriend hurt the dog anyhow, with her hand, maybe not by purpose, but simply it was so strong experience for the dog, that since then he is affraid of her touching him?
It is difficult to give ideas or suggestions like this, without knowing the situation at your house, the dog and you and your girlfriend.
However, I think that punishing the dog everytime he growls does not lead anywhere. He might stop growling and start biting instead. Now you at least get warning.
I´d think, that to make up things between the dog and your girlfriend, you should go absolutely different way. She should be the only one to do all things that are important and good for the dog. That means, she should be the only one to feed him and to give him treats. She should be the one to play with him and take him for walks and do anything with the dog, that he loves to do. With this way, the dog will start to see your girlfriend again as a source of great things and not a threat.
If the dog would growl at her, I think the best thing would be to turn around, totally ignore him and go away. But it would also mean he will not get his food, toys, the game is over and so on. He would figure out things very quick, what is better!
But it is also possible, that the problem is in hierarchy in the pack, that the dog simply decided not to respect your girlfriend etc. Then the solutions would have to be similar, yet different. Therefore I´d suggest you should contact your breeder for advice, other CSW owners/trainers in the area who might come see the dog and the situation and so on. I do not think there are any certified dog behaviourists in CR for the moment. But definatelly there exist better ways of solving dog problems, than punishment and choke collars.

Btw., there´s list of great books, that will open your eyes to the world of dog thinking and how to deal with them. You can get them on Amazon for example, in English. I´d suggest for example Patricia McConell - The other end of the leash, For the love of a dog and then books by John Fisher - Think dog!

Good luck.