Symptom diary for pets: catching small changes early

Dogs and cats cannot tell you when something feels off. What they can do is show it, in small behavioral changes. Those changes are easy to notice on any single day. They are just as easy to forget by the time you are sitting in a vet's office trying to remember when it started.

This feature is sometimes called the Behavior Diary and appears in the app as the Symptom Diary. Either name points to the same idea: a place to log the small, everyday changes that, taken together, tell you something useful.

Why small changes are worth logging

Cats in particular are known for hiding signs of pain and illness, an instinct left over from being both predator and prey in the wild. A cat that is unwell often keeps eating, keeps using the litter box, and looks outwardly normal. The real signs are smaller shifts, like hiding more, grooming differently, or losing interest in play. Dogs are usually more visibly expressive, but the same principle applies. A change that seems minor on its own is often the first real clue.

The other reason logging helps is memory. Without a written record, "since when" is one of the hardest questions to answer accurately. Was it three days ago or three weeks? A dated log turns a vague impression into a timeline. A vet needs exactly that to narrow down what might be going on.

What to log

You do not need to log everything, every day. The most useful entries are tied to a real change. Eating less than usual, an accident outside the litter box, more limping than normal, or a new patch of redness are all worth a note. A few categories cover most of what owners notice day to day.

Logging a symptom in PetNid

The goal is to make logging quick enough that you actually do it in the moment, rather than trying to remember later.

1

Open Symptom Diary and start a log

From the add menu, choose Add Symptom Log, or open Symptom Diary from the Pet Care tab and tap the +. Pick the category that fits closest, such as Eating & drinking or Discomfort.

2

Add the specifics

Each category shows fields tailored to it. For eating, that means what changed and how much. For discomfort, it means the body area and the signs you noticed. Rate how concerning it seems, from Normal to Concerning, and add a note if it helps.

3

Add a photo if it helps

For anything visible, a skin change, a limp, a wound, add up to 3 photos. A photo from when you first noticed something is often more useful later than a description, especially if it changes over the following days.

Turning logs into something your vet can use

A running log is useful on its own, but it is even more useful at a vet visit. From Symptom Diary, tap Export symptom PDF to create a clean summary of your entries, ready to hand over or share. That beats trying to recall two weeks of small details from memory in a ten-minute appointment.

• Recent logs show up on the Symptom Diary home screen, organized by day
• Each entry keeps its category, details, concern level, and any photos together
• Export a PDF summary to bring to a vet visit or share with a family member
• A consistent log makes it easier to tell a passing off day from an actual pattern

• Log a change when you notice it, not days later from memory
• Pick the closest category rather than trying to describe everything in notes
• Add a photo for anything visible, especially if it might change over time
• Rate how concerning it seems so a pattern of worsening entries stands out
• Export a PDF before a vet visit if you have been logging something specific

Preparing for an appointment? The guide to vet visits covers what else is worth bringing along.