My ginger boy is almost 1 year old (his birthday in 3 weeks!). We've had him since he was 9 weeks old.
His poo has always been horrific and he's always had a bit of a sensitive belly (Dreamies being the main culprit). We worm him regularly and keep an eye on what he eats as much as we can (he's very much an outdoor boy and also steals food when our backs are turned - the latest being a Portuguese custard tart).
As long as we've had him he's gone through phases of having slightly bloody poo and a slightly bloody bottom. We've taken him to the vet so many times - each time we're told to keep an eye on it and that's it, each time it goes away.
He's a happy little chap, only ever off his food once when he had a high temperature after a paw injury. It hardly ever seems to bother him (except the time I caught him dragging his bum on my new carpet 🙄).
I don't know if I'm being fobbed off by my vet, if I need to be restricting him more, if I need to keep taking him to the vet (which stresses him out, he's been a lot for his young age).
Sorry for the slight ramble, hope I made a little bit of sense!