This is my personal opinion (& no doubt the manufacturers & retailers of flea & worming treatments will tell you differently!) but I don't like to subject my pets to these strong chemicals anymore often than absolutely necessary.
I probably use spot on flea treatment once or twice a year on my cats & twice a year on my dogs. I have 2 female cats that don't wander too far & only occasionally manage to catch the odd mouse or bird. They don't mix much with other neighbourhood cats & any terrotorial disputes are unlikely to lead to close contact or fighting. So in these circumstances I don't feel the need to use flea treatment anymore than that.
For worming ~ I don't bother with the cats at all. Now I know some people would disagree & if I ever saw worms in their faeces, or suspected they had worms, I would administer worming treatment immediately. But even if I did, the cats could still go out & pick up worms the next day.
I do worm the dogs about 2 to 3 times a year though as they go to hydrotherapy & one of the conditions is that they are wormed & treated for fleas regularly.
Healthy animals with good immune systems are unlikely to be made very ill with a parasitic infestation ~ & the infestation is unlikely to be anywhere near as bad for healthy animals in the prime of life. But sick, young, old or otherwise ailing animals could suffer more from parasitic infestations ~ so I would be more careful in these circumstances ~ although unhealthy pet cats & dogs are probably less likely to be exposed to parasites anyway.
So, in Dylan's case, & given his less adventurous lifestyle & being more of a homebird now, I would definitely say you are safe to cut down on the flea & worm treatments.
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