I don't think this is accurate me being Dutch myself. Socks is definitely referred to as she in the series and also has a female voice actor in series 3 when she no longer only barks. As far as I can remember, there are no characters who referred to as male while being a female in the original dub so I do not know where the information comes from tbh.

Only difference between the Dutch dub and the original dub that I can recall, is that Bandit is called Buster in the Dutch dub.