Ollie is about 5 years old and was neutered when he came to live with us. A few days ago, I noticed a distinct smell of tom cat in the room and when I investigated, it seemed to be coming from Ollie's skin/fur. It is a little less strong now but it's still there. Funnily enough, last week my other cat Ben, got into a tussle with a strange cat in our garden, I noticed that for a short while after that, Ben had a bit of a whiff about him and wondered if the other cat, who I assumed to be an unneutered male, had transfered some of his scent onto Ben in the tussle or, had Ben produced the smell himself in the excitement of the fight. Anyway, Ben now smells normal. Ollie seems well in himself. All our cats spend a lot of time outside so rarely use their litter boxes so I have not noticed anything about Ollie's urine. I have assumed the smell is of tom cat but, I also wondered if it could be from some plant that he has brushed against because it is not as pungent as cat urine is normally. I will take Ollie to the vet if it continues but I wonder if anyone here can offer an opinion?