Little Branson Figueroa and his puppy, Thanos, are best friends and share a unique bond. Last year, Branson had surgery for craniosynostosis. It occurs when a baby's skull closes before the brain is fully formed. Recently, Thanos’ veterinarian said the dog might have hydrocephalus, a buildup of fluid that can cause brain damage. Thanos will now have to go through some of the same tests and treatments as his human bestie. InsideEdition.com’s Mara Montalbano has more.