A 10-year-old Shih Tzu has recurring circum-anal tumour
Channel: Dr David Sing
Date: 24/11/2016

Nov 22, 2016
This old dog was operated in Taiwan around 6 months ago. The histology report was a cancerous tumour. The circum-anal tumour above the anus grows back again. 

My 2nd opinion is that the tumour is cancerous and will recur within 6 months, after the 2nd removal. The owner has to decide. 
I gave a Tardak injection to shrink the hormone. The dog was said to be neutered, but he was adopted from a shelter. It is possible that there is a left abdominal testicle as I could palpate a lump in the inguinal area when the dog was on the back. 
 
Male dogs who are neutered (2 testes removed) very rarely develop circum-anal tumours which are due to the influence of
male hormones, testosterone.