Unfortunately bringing a 'mature' male into the household has not been the best of things to do you are bringing in an older male into the domain of an immature but entire male and changed pack order it is hard enough to bring a younger male in but to bring into the 6 month old domain a fully mature male is going to be difficult, I am afraid you may have a 'fight' on your hands for some time until the 'pecking' order is sorted. I for one would never 'rehome' a fully mature entire male into a household where there is a younger entire male already established there.

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