Shelter standards are important resources outlining both the minimum acceptable and the ideal practices for housing, husbandry, and medical and behavioural care in animal shelters. These guidelines are designed to be relevant and adaptable for all types of organizations, while simultaneously outlining a minimum standard that all organizations must aim to reach regardless of resource limitations. There are now many self-assessment tools that accompany the guidelines and allow organizations to identify areas for improvement or to use as a part of shelter consultations. The following outlines a number of guidelines and position statements for Shelter Standards in North America.

SECTION 1 — Treating Animals Returning to a Shelter or Foster Home

When an animal will be returning to a shelter or foster home rather than a permanent home, treatment plans need to reflect the realities of those environments.

• Foster homes vary considerably in experience. Some fosters are seasoned medical volunteers comfortable with pills, injections, and complex protocols; others are first-time caregivers. Unless you know the foster’s capabilities, apply the same conservative assumptions as you would for a shelter — and when in doubt, check with the shelter’s foster coordinator before prescribing.
  
• Most shelters have staff present for only 8–12 hours a day, so prescribe medications that can be given once or twice daily at most. Three- or four-times-daily dosing is not feasible and sets the animal up for missed doses or treatment abandonment.
  
  (Important: The shelter is the client — the foster home is acting as the animal’s agent/caregiver onthe shelter’s behalf. Most foster homes do not have authority to authorize treatment, agree to costs, or make medical decisions independently. Significant clinical decisions — diagnostics, procedures, medications beyond routine care — should be approved through the shelter directly, not the foster. When in doubt, call the shelter before proceeding.)
  
• Choose low-stress administration routes whenever possible. Liquid medications are generally easier to give than pills in a shelter setting, and flavored formulations are meaningfully better than bitter ones for animals that aren’t highly food-motivated or easily handled. Reducing the stress of each treatment matters both for the animal’s wellbeing and for staff and volunteer compliance.
  
• Recognize that the “ideal” treatment may not be realistic — financially or practically. Shelters operate under significant resource constraints, and a technically superior treatment that cannot be consistently administered is worse than a good-enough treatment that can. Lead with the highest-value interventions: the ones most likely to make a real difference given the constraints. If you are uncertain what a shelter can support, ask.

SECTION 1 — Treating Recently Adopted Animals

Medical Records

Adopters are sent home with a copy of their animal’s shelter medical records and are instructed to bring them to their first veterinary visit. If a client arrives without records or the records seem incomplete, the records exist — contact the shelter directly by phone or email to obtain them.

Unknown History and Age Estimation

Stray and owner-surrendered animals frequently arrive with no known history. Age is estimated based on dentition and physical condition and should be understood as an approximation, not a confirmed birth date.

Vaccines

Shelter vaccine protocols differ from private practice in meaningful ways. Vaccines are started earlier and given more frequently because disease exposure risk is significantly higher in a congregate setting. Core vaccines and rabies are typically administered at or after 12 weeks of age per ASV guidelines — but many kittens and puppies are adopted out before 12 weeks and will not yet have received a rabies vaccine. This is expected and normal, not an oversight.

One point that surprises many clinicians: a killed rabies vaccine can safely be given within two weeks of an adjuvanted or recombinant vaccine. There is no need to delay.

Spay/Neuter

Pediatric spay/neuter (performed at 8–16 weeks) is common practice in shelters and is safe. A tattoo at the incision site is standard and indicates the animal has been altered — do not mistake it for an injury or marking of unknown origin. Feral or undersocialized cats will have a left ear tip (the tip of the left ear is surgically removed while under anesthesia), which serves as a universal visual indicator of sterilization and previous trapping.

Microchipping

Nearly all shelter animals are microchipped prior to adoption. Encourage clients to register and keep their contact information current in the microchip database — this is one of the highest-yield reminders you can give at a first visit.

Upper Respiratory Infections

URIs are extremely common in shelter cats. The vast majority are caused by feline herpesvirus (FHV-1) and, to a lesser extent, calicivirus. Stress is a major trigger for herpesvirus reactivation — a newly adopted cat showing URI signs in the first days to weeks at home is most often experiencing stress-induced shedding, not a new infection acquired post-adoption. Manage expectations with new adopters accordingly and treat symptomatically.

FIV/FeLV and Heartworm Testing

Not every cat leaving a shelter has been tested for FeLV/FIV, and this is intentional. The ASV guidelines do not recommend universal testing — it is based on individual animal risk and shelter resources. Do not assume a lack of testing indicates negligence.

Heartworm testing practices similarly vary by shelter and region.

Behaviour: Decompression and the 3-3-3 Rule

Shelter behaviour often does not reflect an animal’s true temperament. Animals in a kennel environment are stressed, suppressed, or hypervigilant — what you see is not a reliable baseline. Counsel new owners to expect a structured decompression period, commonly described as the 3-3-3 rule.

Behaviours commonly masked in the shelter and emerging only after adoption include separation anxiety (absent in the kennel, triggered once a bond forms), resource guarding, leash reactivity, multi-pet conflict, and in cats, stress-related marking or spraying. Owners should be advised not to judge behaviour in the first two to four weeks and to allow the animal to explore and settle at its own pace.

Some animals leaving the shelter will have been on medications — gabapentin, trazodone, or other anxiolytics — prescribed to manage kennel stress or facilitate handling. These may no longer be necessary once the animal is in a calm home environment.