“Abscesses smell terrible, putrid,” Wooten says. “You’ll never forget the smell! Abscesses are usually associated with local swelling of the skin, redness, pain, inflammation, and may be oozing pus.”
Article source: https://www.huffingtonpost.co.uk/entry/dog-or-cat-smells-signs-to-see-vet_uk_62fa1bb9e4b095e78881d422