AdvertisementPets Deserve Evidence-Based Medicine, Too, Says The SkeptVetSeptember 03, 2017Ingfei ChenfacebookEmailThe notion that every dog or cat should be neutered at 6 months isn't based on evidence, says veterinarian Brennen McKenzie, author of The SkeptVet blog. It depends on the breed and other factors. Talk to your vet, he advises, about pros, cons and timing. (iStockphoto/Getty Images)