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Why is my intact male dog suddenly marking in the house at 16 months?

Updated On September 23rd, 2025

Pet's info: Dog | Dogue de Bordeaux | Male | unneutered | 1 year and 4 months old

My dog is 16months old house trained since pup but he's recently been peeing in the house aver furniture kids toys anything really that he can cock his leg on it's really getting me down what can I do to try and stop this.

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on February 24th, 2017

I see that Zeus is not neutered - unless he is a show or breeding dogs, this is the first thing I would suggest doing. It's extremely common for intact male dogs to have issues with urine marking in the house once they reach social maturity, usually around 12-18 months of age - so it sounds like Zeus is right on time for this behavior. I would also recommend supervising him constantly when he is in the house so that you can interrupt him if you see him starting to lift his leg, and confining him to a crate or dog-proofed room when you aren't home to help prevent accidents. A belly band (essentially a diaper for male dogs) can also be helpful in the short term while you are working on the problem.

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