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A dog with high levels of blood urea nitrogen resulting from compromised kidneys enables a person to smell ammonia on his pet's breath.

Ammonia, a breakdown product of urea, contains nitrogen.

Urinary tract infection.

Some say it smells sour, while others equate it with the odor of rotting fish.

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  • Even normal anal sacs or glands sometimes secrete a foul fishy smelling liquid, but normal expression is supposed to occur when the dog defecates. So if your dog smells like fish all the time, something is wrong. Infected anal glands can also rupture and drain pus.

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