Important information about your pet’s Rabies vaccination.

If you received a letter or email directing you to this page, our records indicate your pet may have received a rabies vaccine from an impacted manufacturing lot.

We understand this news may be concerning. Please know that Humane Colorado and Elanco Animal Health are working together to help ensure affected pets remain protected against rabies.

What happened?

Elanco Animal Health, the manufacturer of the rabies vaccines your pet received, has notified veterinary providers that several rabies vaccine lot numbers met manufacturing standards when initially released but were later found to be below potency requirements during routine quality assurance re-testing.

This means the vaccine administered to your pet may not provide full protection against rabies for the entire 12-month vaccination period.

There are no reported safety concerns associated with these vaccines. The concern is related only to the vaccine’s ability to provide protection for the full duration of immunity.

What lot numbers were affected?

• E162767A
• E162767C
• E167567A
• E191877A

Does my pet need another rabies vaccine?

If your pet has already received another rabies vaccine since receiving the impacted vaccine, no further action is needed.

If your pet previously received a vaccine from one of the recalled lots listed above and has not yet received another rabies vaccine, Elanco recommends revaccination in accordance with state and local regulations. The lot number is located on your pet’s rabies vaccination certificate. If your pet received vaccines through one of our community services programs, the certificate is available on your pet patient portal.

We encourage you to speak with your veterinarian if you have questions about your pet’s vaccination status.

Revaccination through Humane Colorado

If your pet was vaccinated through Humane Colorado and received an affected rabies vaccine, your pet is eligible for rabies revaccination at no cost through our Community Vaccine Clinics.

To schedule your pet’s complimentary rabies revaccination, please use the appointment link below.

Appointments must be scheduled and completed by October 31, 2026.

Limited Availability

Due to the number of impacted pets, appointment availability may be limited. We encourage you to schedule as soon as possible.

If you are unable to find an available appointment, please complete the assistance form below and a member of our team will contact you.

Need Assistance?

Please complete the form below, and a Humane Colorado team member will review your submission and contact you as soon as possible. You may also contact us directly at:

If you choose to use your own veterinarian

You may choose to have your pet revaccinated through your regular veterinarian.

If your pet is revaccinated by another veterinary provider, please contact Elanco Animal Health within 45 days of receiving your notification letter for additional information and assistance.

Elanco Animal Health
Phone: 1.888.545.5973

Frequently Asked Questions

Does this affect other vaccines my pet received?
No. This notification applies only to certain lot numbers of a 1-year rabies vaccine manufactured by Elanco Animal Health. No other vaccines your pet received were affected.

Is the vaccine unsafe?
No. This is not a safety issue. The concern is that certain vaccine lots may not maintain the expected level of potency for the full duration of immunity.

Why am I receiving this notification?
Our records indicate your pet received a rabies vaccine from one of the affected lot numbers. We are contacting all impacted clients so they can take the appropriate action if needed.

Thank you

We recognize that this situation is unexpected and may create inconvenience for you and your pet. We sincerely apologize for the additional steps required and appreciate your partnership in helping ensure your pet remains protected against rabies.

Have a question or experiencing difficulty finding an appointment time? Fill out this form.