"Le chien des voisins mordrait tout le monde."

Translation: The neighbors' dog would bite everyone.

[JohnV770857]

Possessive case requires an apostrophe.

[Claire721957]

Your translation on this page includes an apostrophe, well done, it's in the right place too, but the text available to select on the main page does not.

[crsykes]

Agreed.

[Kevin968039]

By any chance did anyone happen to notice the issue with the apostrophe? ;-)

[sandys]

The neighbors' dog ...

[ichewtinfoil]

Neighbours is missing the possessive apostrophe. (Several comments already say this here)

[Anton708429]

J'ai lu cette phrase en entendant le chien de mes voisins aboyer