My dog keeps snorting cat lit!

[Amapoleon]

Her nose, not surprisingly seems quite irritated. Do you think it's safe to squirt some sterile water up her nose?

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I wouldn't, in case you force any bits of cat litter further up. She should sneeze them out.

Is she snorting the litter or trying to eat the cat poo like my revolting but lovely dog does?

Both, she truly is foul!