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I have a strong opinion about the blue flea collar my aunt used to buy, and it is not a polite one. That thing sat on her cat's neck like a slow poison sticker, and we now know better, or we should. You can absolutely keep ants off the counter and fleas out of the carpet without turning your home into a chemical field the cat walks through eight times a day. I've done it in a flat with two cats and a flea problem that showed up one July and refused to leave.
Start with fleas, because that's the one people reach for the heavy stuff on. The safe play is a vet-approved product made for cats, full stop. Not a dog product. Not a shared spot-on. The permethrin in most dog flea treatments is straight-up toxic to cats, and I've read too many stories of a cat groomed by a dog treated with the wrong drop and ending up at emergency. Labels exist because the deaths were real. Read them. The bottle that says for dogs means for dogs.
Beyond flea products, a few items belong nowhere near a cat. Snail and slug baits with metaldehyde will kill a cat that licks them off a paw, and cats go after them because the bait is often flavoured to attract. Some common insecticides, the granular lawn treatments, the old organophosphate stuff, all dangerous. I keep a strict rule: if I wouldn't let a toddler crawl through it, the cat doesn't either. The cat is basically a toddler that can jump to the counter.
For ants in the house, I skip the spray can entirely. A line of food-grade diatomaceous earth along the skirting board works, but here's the caution nobody mentions: the dust is only safe if it stays put and you don't breathe it. I apply it with a tiny squeeze bottle, wear a mask, and keep the cats out of the room until it settles. Food-grade, not pool-grade. Pool-grade is not for living things.
Flies and mosquitoes are easier. A covered bin, a screen on the window, a fan moving air across the room, and the mosquitoes lose interest. I bought a small zapper for the back porch and the cats watched it like television, which was funny until I realised the zapper was also cooking insects above their water bowl. Moved it. Simple fixes, no poison.
Yard treatment is where people slip. The lawn service shows up, sprays, and the cat goes out four hours later and rolls in the damp grass. I told our service explicitly no spraying where the cats roam, and I keep them inside the day of any treatment. If you do your own, pick a cat-safe product and follow the re-entry time like it's law. The label's wait period is not a suggestion.
My broader stance is boring on purpose. Less is more. A single ant trail gets a targeted dab of borax-and-sugar bait placed where no cat can reach, inside a little plastic guard, not smeared on the floor. The cat never sees it. The ants do. That's the whole philosophy: put the poison somewhere only the bug can get to, or don't use poison at all and let the boring methods do the work.
There's also the question of when to just tolerate the bug. A single fly is not an emergency. A few ants after rain are not an invasion. I used to spray at the first sign and I've relaxed into someone who watches first. Most insect problems in a cat home are small and seasonal, and a calm afternoon with a vacuum and a closed window solves more than people admit. The poison should be the last tool, not the first reflex.
The non-chemical step people skip is the washing. Flea eggs are not on the cat, they're in the rug and the bed and the seams of the sofa. I wash the cat's bedding hot once a week during flea season and run the vacuum daily, then bin the vacuum bag outside so the eggs don't hatch back into the house. It's dull work. It's also the part that actually ends the cycle without a drop of poison near the food bowl.
When in doubt, ask the vet, not the person with the display stack at the pet shop. I once almost bought a natural flea wipe that listed pennyroyal, which is nasty for cats, because the label said gentle. The vet laughed, kindly, and pointed at the ingredient. The safe products are boring and they're prescribed, and that boredom is the point. If a bug remedy sounds like a spa treatment, read the fine print twice.
I'll end where I started. The cat lives closer to the floor than you do, licks its feet, and trusts that what's in the house is safe. That trust is the only safety system it has. Don't be the reason it was wrong.