Lists of pet-friendly places expire. Rules don't. What Mexico City law asks of you on any street, what the RUAC is, and how to check a place before you go.
Search "pet friendly CDMX" and you'll find twenty lists. Nearly all say the same thing, hardly any say when the information is from, and several send you to places that have closed.
The underlying problem is that a list expires and a rule doesn't. If you know what applies across the whole city, and you know how to ask before you go, you stop depending on whether someone updated a blog.
This is the second thing.
The Ley de Protección y Bienestar de los Animales de la Ciudad de México, in article 4 Bis 1, puts the obligations on the person responsible for the animal. The four that touch you every time you go out:
A leash, whenever you're out with them. The text requires keeping the animal "sujeto con una correa" while in transit, and moving about "sin riesgo para las personas y otros animales". It applies on public streets, in urban parks and in Áreas de Valor Ambiental.
Picking up waste. Explicit in the law, with the same three locations: public streets, urban parks and Áreas de Valor Ambiental. Not a courtesy — an obligation.
A muzzle in specific cases. The law asks for one "tratándose de perros con antecedentes de agresión, o poca socialización". That's a description of a situation, not of a breed.
And the one almost nobody complies with: what the collar has to say. Under the same article, the collar or harness must carry the animal's name, the RUAC key, and the contact details of the person responsible.
That third one deserves its own section, because most people walking dogs in this city have never heard of it.
The RUAC is Mexico City's single registry of companion animals. The law asks you to register the animal — directly or during mass campaigns — and for the key you're given to travel on their collar, along with your phone number.
What it does in practice: it's how a lost animal gets connected back to its home without depending on someone having your number written down. A tag with a name and no contact details is decoration. A tag with a name, a key and a phone number is a route home.
Registration is done on the city's official site — it's in the sources at the bottom — and it's worth doing before you need it rather than after.
Write the key down wherever the rest of your pet's history lives. It's the kind of detail that gets asked for, forgotten, and looked up again; and if you ever have to read it out over the phone in a hurry, you'll be glad it wasn't buried.
It's the most-asked-about place in the city and the most confusing, because the answer is neither yes nor no: it depends on the section.
According to Pro Bosque Chapultepec, which manages the park:
And here's the detail that ruins a lot of Sundays: to enter the Parque Canino they ask for the RUAC and an up-to-date vaccination and deworming record. There's also a limit of six dogs per person, no food inside, and no dogs under four months or animals that are unwell.
As far as we know it's the only public place in the city that will ask for the card at the gate. Worth bringing — or bringing a photo of it.
For everything else — cafés, terraces, plazas, hotels — the method beats the list. Three questions by message or phone, none of which is answered by "we're pet friendly":
And one rule about sources: believe what the venue publishes, not what a list publishes. A two-week-old post on the café's own account is worth more than a two-year-old article with twenty addresses.
None of this is a reason to stay home. It's a reason to send a message before you get in the car.
At some point half this city will ask you for something written on a piece of paper you don't have on you: the RUAC key, the date of the last vaccination, the phone number that belongs on the tag.
Today in Maskotis you can register your pet and keep their details and care events there, so that paper stops being the only place any of it exists. What a digital card actually is, we wrote here, and the eight dates worth recording are here.
If you do one thing after reading this: go and look at what your dog's tag actually says.
Rules change and so do opening hours. Check the source before you go — we're not lawyers and this isn't legal advice, it's where it's written down:
Maskotis does not give medical recommendations and this article is not a substitute for a veterinary consultation. Take them to the vet you trust, or to the nearest clinic — they'll help you there.
It sounds like a step backwards and it isn't. There are four specific moments where paper wins, which is why printing is part of the product rather than an accessory.
Feature lists don't help you decide. Seven questions that do — including the three no app answers on its home page. And yes, we're one of them.
You're going to post the photo anyway. These five take exactly as long, and in three years they'll be worth far more than the photo.