Hi
I think the risks to him of not being neutered are greater than any risks of cystitis. Unneutered cats lead a more dangerous life style which is statistically proven to lead to a shorter life span. You have already noted his roaming and fighting. That could eventually lead him into some real scrapes and dangerous situations. Feeding wet food is certainly a help against bouts of cystitis so I suggest you carry on feeding that and opt for having him neutered.
Cathy Wickenden BVet Med MRCVS
Barton Lodge Veterinary Centre
1 Midland Road, Hemel Hempstead, Hertfordshire, HP2 5BH
Tel: 01442 216048 24 hours
[
www.bartonlodgevets.co.uk]