Choosing a dog
What should I know about adopting a dog with an unknown history?
Last updated 23 September 2026 · How we write and check this
Short answer
Many shelter dogs, particularly strays or those surrendered anonymously, come with little to no background information, which means some early behavior and health details will only become clear once the dog settles into your home. Approach the first weeks with patience, watch closely rather than assuming anything about the dog's past, and stay in touch with the shelter or a trainer if unexpected behaviors appear.
What shelters can and cannot tell you
Staff can usually describe how a dog has behaved during its time at the shelter, including reactions to handling, other dogs, and daily routines, even without knowing its full backstory. What they generally cannot know is exactly how the dog was raised, whether it experienced past trauma, or how it will react to situations it has not yet encountered, like children, cars, or a specific type of noise.
What the first few weeks often reveal
Many dogs go through a settling in period, sometimes called the two week or three week adjustment, where their true personality gradually emerges as they relax into a new routine. A dog that seems quiet and withdrawn at first may become considerably more playful or confident once it trusts that the new home is stable and predictable.
Handling surprises calmly
If a specific fear or reaction emerges, such as flinching at raised hands or particular objects, note the pattern and consider speaking with a qualified trainer or behaviorist for guidance rather than guessing at a cause. Most unknowns resolve into manageable, ordinary traits once you understand your dog's specific triggers and preferences.
Keeping a simple log during the settling in period
Jotting down small observations, like what times of day your dog seems most relaxed or which situations cause hesitation, helps you notice patterns over the first few weeks that might otherwise blur together. This log is also useful to share with a vet or trainer if a concern comes up later.
Key takeaways
- Shelter staff can describe current behavior but rarely know a dog's full past.
- Many dogs need two to three weeks before their true personality fully emerges.
- A quiet or withdrawn start often shifts as the dog settles and gains confidence.
- Consult a qualified trainer if a specific fear or reaction pattern appears, rather than guessing.