this is not uncommon. You stated that he is 5 and that started marking recently with the introduction of a new male unaltered dog. Since the neuter was done at a late stage the instincts are there but in his case there was no need to do so until a male unaltered dog made an appearance. Too assume a male just because neutered will no longer show interest in a female that comes into season is sorry to say far from the truth. A neutered male can and will still occasionally tie with an unaltered bitch and as for the unaltered male, this is only provoking the neutered male to act on those instincts that were not curbed by early neutering. The reason why 4 to 6 months for neuter and spay is to avoid just these things from occurring. Once a male or female has reached age to breed whether healthy or not instincts will become apparent if opportunity arises. Until this point the male has probably not seen any other males that posed a challenge to him in this area.
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No I am not a Miniature Doberman, I was around 200 years before Louis Doberman created the Dobie and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher.
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why does my castrated dog still mark his territory and show interest in females? 
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