Pet policy is exactly the kind of detail that changes fast and gets misreported easily, a shop can go from welcoming dogs to restricting them (or the reverse) with a single ownership or management decision, so we do not guess at this citywide. What follows is the specific, small list of Marikina shops where a source we found while researching the shop directly mentioned pet-friendliness.
Do Güd Cafe in Parang is described by reviewers as a plant-filled, pet-friendly hidden spot that is also genuinely easy to work in. Riverfolk Cafe in Jesus de la Peña is described the same way, pet-friendly and full of character, alongside praise for its guest-roaster beans. Kōhī Kurabu in Malanday is noted as both work-friendly and pet-friendly. Match Better Cafe, address unconfirmed but generally in the Flamingo Street area, is described as genuinely pet-friendly, and notably has a pet grooming salon attached, a fairly strong signal on its own.
That is the full list as of this writing, four shops out of the dozens active in this directory. This is very likely an undercount of the true number of pet-friendly cafes in Marikina, plenty of shops probably welcome pets without anyone happening to mention it in a review we found, but we would rather publish a short, accurate list than a longer, guessed one that gets someone turned away at the door with their dog. Plain Sight Coffee's roundup of pet-friendly specialty shops is a useful wider list if you are willing to travel outside Marikina.
If you are planning a visit specifically to bring a pet somewhere not on this list, the safest move is a quick message to the shop's Facebook or Instagram page before you go, most Marikina shops are active enough on social media to answer a same-day question, and shop-specific links are available on each shop's page in this directory. Toto and George and TripZilla Philippines both maintain broader Metro Manila pet-friendly lists worth checking alongside this one.
If you know a shop that welcomes pets and is not listed here, tell us directly through our shop submission process, this is exactly the kind of gap that gets fixed with a genuine tip from someone who has actually been there.