Well we have a bit of a conundrum here.

Lupin says the Kiss sucks the soul out, which means it is lost, gone forever - but not necessarily that the kiss actually destroys or digests the soul itself. The kiss is merely what 'Dementors do to those they wish to destroy utterly' - leaving behind an empty, unfeeling, memoriless, still-living body.

(Sounds like it's a case of: once the soul is separated from body by the Kiss, it can't get back in; even with a horcrux, a new body has to be made to play host, as Voldie did for himself in GoF.)

In DH, Hermione says you can only destroy the soul-fragment hidden inside a horcrux by destroying the object itself, putting it ‘beyond magical repair,’ because ‘the fragment of soul inside it depends on its container, its enchanted body, for survival. It can’t exist without it.’

That would imply, given that the Dementor's Kiss does no physical damage to the body, that it wouldn't destroy the horcrux by feeding on it. It would only detach the soul fragment from the undamaged object, leaving it free to float around and, eg. go back into the undamaged object again.

What we don't know is whether a Kiss-detached soul is rendered permanently incapable of re-attaching itself to any host body or object (meaning: even though the soul-fragment isn't destroyed, it is no longer usable by its owner, since it can't be put into an object or body again).

If that's the case, then a Dementor's Kiss would render a horcrux useless, even though it didn't destroy the soul-fragment.

Also: it might be difficult to persuade or order a Dementor to feed on a horcrux. They are attracted to emotions after all, especially positive emotions, and horcruxes don't have those positive emotions, so they won't feel as strongly (and therefore as rich and tasty) as a full-souled person. They would be both less appetising and less easy to detect, for Dementors, since we know from PoA that a Dementor's feeling-sense can be confused by something as little as a person transforming into a dog.

(It might even be that Dementors can only detect a soul/fragment with positive emotions currently in it, which would make a horcrux essentially invisible.)

Well we have a bit of a conundrum here.

Lupin says the Kiss sucks the soul out, which means it is lost, gone forever - but not necessarily that the kiss actually destroys or digests the soul itself. The kiss is merely what 'Dementors do to those they wish to destroy utterly' - leaving behind an empty, unfeeling, memoriless, still-living body.

(Sounds like it's a case of: once the soul is separated from body by the Kiss, it can't get back in; even with a horcrux, a new body has to be made to play host, as Voldemort did for himself in Goblet of Fire.)

In Deathly Hallows, Hermione says you can only destroy the soul-fragment hidden inside a horcrux by destroying the object itself, putting it ‘beyond magical repair,’ because ‘the fragment of soul inside it depends on its container, its enchanted body, for survival. It can’t exist without it.’

That would imply, given that the Dementor's Kiss does no physical damage to the body, that it wouldn't destroy the horcrux by feeding on it. It would only detach the soul fragment from the undamaged object, leaving it free to float around and, eg. go back into the undamaged object again.

What we don't know is whether a Kiss-detached soul is rendered permanently incapable of re-attaching itself to any host body or object (meaning: even though the soul-fragment isn't destroyed, it is no longer usable by its owner, since it can't be put into an object or body again).

If that's the case, then a Dementor's Kiss would render a horcrux useless, even though it didn't destroy the soul-fragment.

Also: it might be difficult to persuade or order a Dementor to feed on a horcrux. They are attracted to emotions after all, especially positive emotions, and horcruxes don't have those positive emotions, so they won't feel as strongly (and therefore as rich and tasty) as a full-souled person. They would be both less appetising and less easy to detect, for Dementors, since we know from PoA that a Dementor's feeling-sense can be confused by something as little as a person transforming into a dog.

(It might even be that Dementors can only detect a soul/fragment with positive emotions currently in it, which would make a horcrux essentially invisible.)

Well we have a bit of a conundrum here.

Lupin says the Kiss sucks the soul out, which means it is lost, gone forever - but not that the kiss actually destroys or digests the soul.

(Sounds like it's a case of: once the soul is separated from the body, it can't get back in; even with a horcrux, a new body has to be made to play host, as Voldie did for himself in GoF.)

In DH, Hermione says you can only destroy the soul-fragment hidden inside a horcrux by destroying the object itself, putting it ‘beyond magical repair,’ because ‘the fragment of soul inside it depends on its container, its enchanted body, for survival. It can’t exist without it.’

That would imply, given that the Dementor's Kiss does no physical damage to the body, that it wouldn't destroy the horcrux by feeding on it. It would only detach the soul fragment from the undamaged object, leaving it free to float around and, eg. go back into the undamaged object again, or go hide out in the Albanian woods.

What we don't know is whether a Kiss-detached soul is rendered permanently incapable of re-attaching itself to any host body or object (meaning: even though the soul-fragment isn't destroyed, it is no longer usable by its owner, since it can't be put into an object or body again).

If that's the case, then a Dementor's Kiss would render a horcrux useless, even though it didn't destroy the soul-fragment.

Also: it might be difficult to persuade or order a Dementor to feed on a horcrux. They are attracted to emotions after all, especially positive emotions, and horcruxes don't have those positive emotions, so they won't feel as strongly (and therefore as rich and tasty) as a full-souled person. They would be both less appetising and less easy to detect, for Dementors, since we know from PoA that a Dementor's feeling-sense can be confused by something as little as a person transforming into a dog.

(It might even be that Dementors can only detect a soul/fragment with positive emotions currently in it, which would make a horcrux essentially invisible.)

Well we have a bit of a conundrum here.

Lupin says the Kiss sucks the soul out, which means it is lost, gone forever - but not necessarily that the kiss actually destroys or digests the soul itself. The kiss is merely what 'Dementors do to those they wish to destroy utterly' - leaving behind an empty, unfeeling, memoriless, still-living body.

(Sounds like it's a case of: once the soul is separated from body by the Kiss, it can't get back in; even with a horcrux, a new body has to be made to play host, as Voldie did for himself in GoF.)

In DH, Hermione says you can only destroy the soul-fragment hidden inside a horcrux by destroying the object itself, putting it ‘beyond magical repair,’ because ‘the fragment of soul inside it depends on its container, its enchanted body, for survival. It can’t exist without it.’

That would imply, given that the Dementor's Kiss does no physical damage to the body, that it wouldn't destroy the horcrux by feeding on it. It would only detach the soul fragment from the undamaged object, leaving it free to float around and, eg. go back into the undamaged object again.

What we don't know is whether a Kiss-detached soul is rendered permanently incapable of re-attaching itself to any host body or object (meaning: even though the soul-fragment isn't destroyed, it is no longer usable by its owner, since it can't be put into an object or body again).

If that's the case, then a Dementor's Kiss would render a horcrux useless, even though it didn't destroy the soul-fragment.

Also: it might be difficult to persuade or order a Dementor to feed on a horcrux. They are attracted to emotions after all, especially positive emotions, and horcruxes don't have those positive emotions, so they won't feel as strongly (and therefore as rich and tasty) as a full-souled person. They would be both less appetising and less easy to detect, for Dementors, since we know from PoA that a Dementor's feeling-sense can be confused by something as little as a person transforming into a dog.

(It might even be that Dementors can only detect a soul/fragment with positive emotions currently in it, which would make a horcrux essentially invisible.)