If you are animal lover and you don't want to use any product that uses any part of dead animal or you just don't feel comfortable butt plug with real tail, you can always get butt plug with faux tail.
As you can imagine, not all butt plugs with tail can even use real tails. We are talking about dog tail butt plugs, devil tail butt plugs, pig tail butt plugs, and similar one. You can use any of those without any fear that any animal was harmed.
Its a different story when it comes to more popular butt plugs with tail, like fox tail plugs, horse tail plugs, bunny tail plug and similar.
Fox tail butt plugs are usually the one that most commonly use real fox tails. In most cases, they use tails from foxes that died of natural causes (old age, killed in accidents, ect.).
Interesting fact, bunny tail butt plugs are also often made out of fox tail or fox fur. Which is a bit unusual, but true nevertheless.
Horse tail butt plugs often use real horse tail, because it adds authenticity. In most cases they collect horse hair that falls off a horse while grooming it.
If you really don't want to buy animal tail butt plug with real fur/hair, make sure manufacturer uses faux fur or hair. There is plenty of butt plugs with faux tails.
There is another thing. Real tails are often more expensive and a lot harder to maintain, especially when it comes to cleaning. Take that into consideration when you are buying one.
Now that you know what to expect, you can make right decision for yourself. Enjoy it.