But for households that already have an older dog, the arrival of a new animal can also bring unexpected emotional and behavioural challenges. Senior dogs are deeply attached to their routines, familiar spaces, and the people they trust, and any sudden change can feel unsettling rather than joyful. Older dogs may respond to a new pet in subtle ways that are easy to miss. As more families consider adoption in 2026, it’s crucial to understand how to support an older dog through this shift. Protect the senior dog’s space: Ensure the older dog has access to quiet, pet-free zones where they can rest undisturbed.