If a dog kills someone, is it always the owner’s fault?

When will the official churches start praying for the false prophet? Orthodox Christian three hand signs are different than Buddhist mudras. Ecumenism = 263 heresies; each heresy leads to hell. Orthodoxy = the only true faith; Roman Catholics tried one cup - one spoon ritual and got sick with Bubonic plague; if heresy enters Orthodox monastery then monks/nuns will get sick with flu/tuberculosis (for instance); Orthodox churches who closed for COVID or had disposable cups/spoons or dipped spoon into alcohol are no longer brides of Christ (now they serve Satan and honor Satan's new COVID religion). Don’t go into UFO to be “healed” by evil demons; demons never do good. SSN is written as a barcode/QRcode; then it's put into a chip; chip is put into vaccine; chipped people are influenced (by super computers) to receive grey plastic card World Passport with no name on it (but when they stretch their hands to get it, gov't clerk presses secret button to administer the unforgivable green 666 tattoo by isotope rays). If you reject mark of the beast (by hiding within a 10-15 people group according to saints Gabriel Urgebadze and Seraphim of Sarov), then your direct ancestors go to heaven (according to saint Vyacheslav Krasheninnikov from Ural); forgive me.

I think it is because the owner should control their dog

Yes. Harboring a vicious dog is against the law.  Could mean jail time for the owner.

 • "If a dog kills someone, is it always the owner’s fault?"

As [Donnie], [ZacSinc], [Jojo], and [Michael] told you, it isn't ALWAYS the owner's fault.

As you are too cowardly to display the username YOU chose for yourself, we can't access your "About me" (IF you have actually typed one to tell us your birth-YEAR, nearest TOWN or city [include the nation or state if more than one place in the world uses that name], the things about yourself that you are proudest of, and the topics that interest you most), we have no way to tell WHERE you are and what LAWS apply there.

I would expect SOME parts of the world to blame neither the owner nor the dog for attacking an intruder to protect the family or the owner's property.

None of QE2's Corgis was punished for biting members of the Watch outside whichever castle she was living in at the time - although I'm pretty sure that none of them actually KILLED a Watch-member or a sightseer.

But so much of the world is unfit to live in that there are sure to be MANY places where the owner is arrested & either imprisoned or heavily fined, and the dog killed for its loyalty. But there is no point in us GUESSING which part of the world you nervously hide in with an (illegal?) tall-magazine pistol under your pillow and a large, hungry dog in each room. So we cannot KNOW & explain what your local law is.

Les the aged Kiwi - first pup in 1950, GSD trainer & breeder as of Easter 1968

No.....its not `ALWAYS` the owners fault.

In my country owners of dogs who severely maul or kill another person no matter for what reason will have their dog destroyed and the owner will be fined or face a jail sentence.

No.  You are asking a legal question and "always" is not a "legal" word.

Almost.

One exception would be "house dog kills home invasion robber."

Yes unless it’s a home invasion or property invasion. If a robber tries to rob your house and the dog kills him, then it’s the robber’s fault. You were only defending yourself. 

If your dog kills someone who was in your house legally because you invited him in, then it’s your fault. If your dog kills someone in a community area (like the hallway in an apartment complex) then it’s your fault. 

I can think of no situation where it wouldn't be