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Why does my dog's rear smell bad and he keeps rubbing his bottom?

Updated On September 23rd, 2025

Pet's info: Dog | Cavalier King Charles Spaniel | Male | neutered | 9 years and 7 months old | 30 lbs

I have a nine and a half year old King Charles Cavalier Spaniel,slightly overweight however his annual booster and check up showed he is in good heath. We now reside in France and he has developed over last week or so a nasty odour from his rear? He spins on the spot at times and has rubbed the fur of his bottom area a little and developed a soft lump to the side of his bottom ,that is not where the leak is from it is from his anus and smells like the elephant zoo,it does not look like blood in

1 Answer

Most Helpful Answer

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Answered By Amy S. Eutsey, DVM

Veterinarian

Published on June 14th, 2018

Hello. It sounds like Aramis may be suffering from an anal sac infection. The soft swelling would be present just off to the side of the anal opening...either on right or left. He may continue to ooze smelly fluid out of the anal sac opening which is just inside the anus. These abscessed are painful, itchy and can eventually rupture leaving a draining home in the skin. Aramis needs to see a vet to have the infection drained and for the anal sacs to be emptied. This may require sedation as it can be quite painful. He should then be prescribed an antibiotic. Your vet will probably want to recheck the area in a couple of weeks as these infections are stubborn to get rid of sometimes. Thank you for using Petco Pet Education Center, formerly Petcoach.

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