When a dog enters a municipal pound, it goes through a structured process: identification scanning, health screening, vaccination, behavioral assessment, and a legally mandated holding period. If the dog isn’t reclaimed by an owner or adopted within that window, it may be transferred to a rescue, placed in foster care, or euthanized. Beyond the procedures, the pound environment itself takes a measurable toll on a dog’s body and behavior, with stress hormones spiking within the first day and noise levels high enough to cause physiological harm.
What Happens at Intake
The moment a dog arrives at a pound, staff create a record with a unique identifier, either a name, number, or both. The first priority is finding out whether the dog already has an owner. Staff scan the dog multiple times with a universal microchip reader and check for tags or other identification. If a match is found, the shelter contacts the owner directly.
Every dog also receives an initial health evaluation. Staff look for signs of infectious disease, injuries, or any condition needing immediate treatment. This evaluation gets documented in a medical record that follows the dog through its entire stay. Dogs are then separated by species, age, and health status to reduce the spread of illness and minimize conflict between animals.
For owner-surrendered dogs, staff collect a behavioral history and the reason for relinquishment. This information helps the shelter assess whether the dog has a known bite history, anxiety issues, or other behavioral patterns that will affect its placement options.
Vaccinations and Medical Care
Shelters are high-risk environments for disease, so dogs are vaccinated at or before intake. The core vaccines protect against distemper, adenovirus, parvovirus, and parainfluenza. Dogs and puppies older than three weeks also receive a nasal vaccine for bordetella and canine parainfluenza, the main causes of kennel cough. After 12 weeks of age, dogs get a leptospirosis vaccine as well.
Rabies vaccination works a bit differently. Since the risk of rabies exposure inside the shelter is low, a rabies shot is typically given before the dog is released for adoption rather than on arrival. If a long stay is expected, though, it may be administered at intake alongside the other vaccines.
Behavioral Assessment
Behavioral evaluation begins at intake and continues during the dog’s stay. Shelters use structured assessments that test how a dog responds to different stimuli: being approached, being touched, encountering food, meeting other dogs, and being left alone. Staff observe whether the dog is friendly and social, fearful, reactive, or aggressive. Specific signs they watch for include growling, showing teeth, snapping, a fixed stare, or attempts to bite.
Many shelters also run a “time alone” test, where the dog is placed in an unfamiliar room and observed for up to 10 minutes. Dogs with separation anxiety tend to vocalize constantly, pant, try to escape, or become destructive. Research has found that friendliness, fear, and anxiety identified during shelter assessments do predict corresponding behaviors after adoption, so these evaluations carry real weight in determining a dog’s future.
The Stray Hold Period
Every state sets a minimum holding period during which a stray dog must be kept before the shelter can adopt it out, transfer it, or euthanize it. In New Jersey, for example, the law requires at least seven days. Some states mandate as few as three to five days. During this window, the shelter attempts to notify the owner through posted notices or direct contact if identification was found.
If the hold period expires and no owner comes forward, the dog becomes available for adoption, transfer to a rescue organization, or placement in a foster home. Owner-surrendered dogs typically don’t have the same hold requirement, meaning they can enter the adoption pipeline or be assessed for euthanasia more quickly.
How the Pound Affects a Dog’s Body
The pound environment triggers a significant stress response. A study measuring cortisol (the body’s primary stress hormone) in shelter dogs found that dogs in their first three days had markedly higher cortisol levels than pet dogs sampled in their own homes. Dogs on day one showed the highest spike. By days four and five, cortisol levels in the same dogs had started to drop, and dogs housed for more than nine days had the lowest levels of any shelter group, suggesting some degree of adaptation over time.
Interestingly, 20 minutes of human interaction, including petting, did not significantly lower cortisol in dogs during those first three high-stress days. The researchers described the pattern as a prolonged activation of the dog’s stress system, meaning the body stays in a heightened alert state that brief comfort can’t easily override.
Noise is another major stressor. Sound levels in animal shelters regularly exceed 100 decibels, roughly equivalent to standing next to a power tool. Peak levels in one study exceeded the 118.9 decibel limit of the measuring equipment. For context, sustained exposure above 85 decibels can damage hearing in humans. This constant barking and clanging of kennel doors creates a cycle: one dog barks, others react, and the noise compounds. Chronic noise exposure in shelters has been linked to behavioral changes, physiological stress responses, and potential hearing damage.
What Determines Whether a Dog Is Euthanized
About 2.8 million dogs enter U.S. shelters each year. Of those, roughly 57% are adopted. Around 320,000 are euthanized annually. The gap is filled by returns to owners, transfers to rescues, and foster placements.
Municipal pounds, often called open-admission shelters, are legally required to accept every animal brought to them regardless of space, health, or temperament. This distinguishes them from limited-admission shelters and rescues, which can turn animals away. To be labeled “no-kill,” a shelter must achieve at least a 90% placement rate, but no-kill does not mean no euthanasia. It means the organization places nine out of every ten animals that come through its doors.
Dogs most likely to be euthanized are those showing serious aggression (biting, attacking, or unprovoked snapping), dogs with severe or untreatable medical conditions, and dogs that simply run out of time in overcrowded facilities. Space is a persistent constraint in open-admission shelters. When kennels are full, the dogs that have been there longest or are assessed as least adoptable are typically the first at risk.
Recovery After Leaving the Pound
The effects of the pound don’t end at the shelter door. The ASPCA describes a “3-3-3” adjustment timeline that most adopted dogs follow. In the first three days, a dog may be shut down, anxious, or fearful. It may refuse food, hide, or seem completely unlike the personality the shelter described. This is decompression, not a permanent temperament.
Over the next three weeks, the dog begins to settle. Stress hormones drop, and more of the dog’s actual personality emerges as coping mechanisms fall away. The dog starts learning routines and testing boundaries.
Full adjustment typically takes around three months, though some dogs adapt faster and others need longer. By this point, the dog has built trust with its new household and integrated into daily life. The physiological stress markers that spiked in the shelter have generally returned to a normal baseline, and behavior becomes more consistent and predictable.