Agree with that.
Currently, parasites. I like all kinds of normal and 'weird' animals (especially spiders...) but parasites get the short end of the stick. Heebie-jeebies.
I admit my pets don't get routine treatments as often as recommended, but I got the cat wormed a couple of weeks ago. (You don't want to know how I discovered it had worms.

) Yesterday I found a bunch of fleas clinging round it's ears. Skin crawls and paranoia goes into overdrive. How long's it had fleas? It gets let in pretty regularly - how many are hopping round the carpets?
I got some spot-on repellent for it and read up on the matter. Thing is, and this is a big part of this moan, is that the dog and household treatments I saw in the shop have to be handled almost like weapons-grade plutonium. Shampoo? Don't rinse it down the drain or fish will go belly up. Dog spot-on? Don't let cats near for three days or
they'll go belly up. Carpet spray? Don't touch affected areas for hours. Then I realised that with all the pyrethrins in it, if I used it anywhere near my spiders, they'd go belly up too. Crazy.
The internet is a grand invention. You can find all kinds of stuff when you search for 'natural flea repellent'.