Why soaked chia won't swell in your dog's throat
Since the chia seeds were already soaked when your cat ate them, they've absorbed all the liquid they're going to. That means even if your dog licks the bowl later, there's no risk of the seeds expanding dangerously in his throat or stomach. The main concern with chia is always the dry form — those tiny seeds can absorb many times their weight in fluid within minutes when swallowed dry.
Your 6 kg dog would need to eat a substantial amount of dry chia to be at risk, and even then, it would have to be swallowed quickly without enough saliva to start the soaking process. What's left in your cat's bowl is essentially a gel-like substance that will pass through without causing blockages. Still, if you notice either pet coughing or pawing at their mouth after eating, check for any seed remnants stuck to the roof of their mouth or teeth.
How much soaked chia is too much for small pets
For your 3.8 kg cat, the amount that would fit in a typical pet bowl is well within safe limits. Soaked chia becomes about 10 times its original volume, so what looks like a tablespoon of seeds was probably just a pinch when dry. Cats and small dogs can handle occasional small portions of soaked chia as the soft gel moves easily through their digestive tract.
The bigger concern would be if either pet got into the dry seed container. Just a teaspoon of dry chia could potentially swell to fill a cat's entire stomach if eaten quickly without proper soaking. That's why it's crucial to store dry chia seeds where curious paws can't reach them — high up in a sealed container is best for multi-pet households.
What to watch for over the next 12 hours
With soaked chia already eaten by your cat and possibly sampled by your dog later, you'll want to monitor both for any signs of digestive upset. While rare, some pets may experience soft stools or mild bloating from the extra fiber. Your cat's smaller size makes her slightly more susceptible to these effects than your 6 kg dog.
Check litter boxes and yard areas for normal bowel movements. The chia gel may make stools appear speckled or slightly gelatinous, which is normal. What isn't normal would be straining without producing stool, repeated vomiting, or a distended abdomen — these would warrant an immediate vet visit regardless of which pet shows them.
Preventing future seed incidents in multi-pet homes
When preparing chia for pets, always soak it thoroughly in water or broth first — at least 10 minutes for full expansion. Never leave dry chia where either pet could knock over a container. Your dog's larger size doesn't make him immune to dry chia risks — throat blockages can happen at any size if enough dry seeds are swallowed rapidly.
Consider feeding chia separately if one pet tends to steal from the other's bowl. For your cat, placing her dish up high where the dog can't reach might prevent sharing. Both pets should have access to fresh water afterward to help the chia move smoothly through their systems. Remember that while this incident is low-risk, dry chia demands much more caution in households with multiple curious eaters.
The full verdict, portion guidance and serving notes are collected on the Chia seeds food facts page.