
Always use a good quality bait station - never, never put rat poison down loose.
Pellets can scatter too easily, and look too like pet kibble to a dog or cat, even though they are generally brightly coloured.
The best poison to use is a block of poison rather than the pellets. Remember - it's lethal, and needs to be treated with respect. Always, always use disposable gloves each and every time you handle poison - even if it's contained in a packet. Please note: Links from this section on are " affiliate links", which means that if you click and buy something, I earn a small commission at no extra cost to you. Because although there's an antidote to the older type of poisons (anti-coagulants) which involves injections of Vitamin K, the newer poisons, introduced as successive generations of rats have become immune to the older, are lethal. And trust me, it's hard to keep chickens away from chasing and eating a half-dead rat. Because there's a very real danger that, if either the poison itself, or a rat which has eaten it, is eaten by a pet - a chicken, for example - that animal is likely to become very ill. It's inhumane and, much as I dislike rats, I hate this idea. The rat dies a very painful death which can take several days. It works slowly by causing internal bleeding. Because it's not a pleasant way of killing.
In other places it's widely available, usually from hardware stores or online.Because rat poison is dangerous stuff - so dangerous that in some places this isn't an option for private individuals - the poison can only be used by licensed companies.