What RENAC is
RENAC is the Registro Nacional de Animales de Compañía, the National Registry of Companion Animals. Uruguay’s animal-welfare law created a national companion-animal registry, and the government’s RENAC information page provides access to registry services, accredited operators and information about authorized microchip distributors.
A microchip is an identification tool, not a GPS tracker. It stores an identification number that can be read by a compatible scanner. The value comes from connecting that number with accurate registry information.
Why adopters should ask about the chip before leaving
When adopting a dog or cat, ask whether the animal has been scanned, whether a chip was found and what steps are needed to update the responsible keeper. If the animal has no known chip, discuss identification with a veterinarian or RENAC operator.
Do not assume that a collar tag and a microchip are interchangeable. A visible tag can help a neighbor contact you quickly, while a chip provides permanent identification if the collar is lost.
Check the data after a move or ownership change
Identification is only useful when records are current. After adoption, a change of phone number, a move or another change in responsible keeper, verify what update is required. The government provides an online RENAC animal query and publishes information for owners and accredited operators.
Keep the chip number in your own records as well. Store it with vaccination documents, veterinary records and a current photograph of the animal.
What a microchip cannot solve
A chip does not prevent escape, replace secure fencing, substitute for leash handling or guarantee that a lost animal will be scanned immediately. It is one layer of a larger safety plan.
Use a properly fitted collar or harness when appropriate, keep contact information current and take new photographs periodically. For cats, secure carriers and screened windows or balconies are equally important parts of prevention.
Use official sources for current procedures
Registry platforms and administrative procedures can change. For current RENAC access, lists of accredited operators and official instructions, use Uruguay’s Ministry of Livestock, Agriculture and Fisheries (MGAP) and INBA resources rather than relying on an old social-media post or copied instructions from a third-party site.
Ask for a scan even when paperwork lists a chip
A number written on a vaccination card is useful, but scanning confirms that a readable chip is physically present and that the number matches the records you were given. This is especially relevant after adoption, rescue transfer or a long period without veterinary care.
If a scanner cannot immediately detect a chip, that does not prove there is none. Chips can migrate from the original implantation area, and scanning technique matters. A veterinarian or experienced operator can check appropriately.
Keep visible identification too
For a dog that safely wears a collar, a simple tag with a current phone number can speed reunification because a neighbor does not need a scanner. For cats, discuss appropriate breakaway collars and identification options with a veterinarian if collars are used.
The best system is layered: secure handling to prevent escape, visible contact information when suitable, a registered microchip and current photographs.
Make microchip verification part of every major transition
Review identification after adoption, moving home, changing telephone numbers or transferring long-term care to another person. Add the chip number to your emergency plan and tell a backup caregiver where it is stored.
If you are unsure how a RENAC record should be changed, use the current MGAP/INBA instructions or contact an accredited RENAC operator rather than attempting to infer the process from older guidance.