Why the leaf matters more than the fruit for your 5 kg cat
The plant's defense system loads its leaves with solanine, while unripe tomatoes carry far less. Even a few nibbles of leaf can deliver a concentrated dose to a small cat like yours. Watch closely for excessive drooling or pawing at the mouth—these often appear within two hours as the bitter compounds irritate her mouth and throat.
Unlike the fruit's flesh, which might only upset her stomach, the leaf's toxins can affect coordination. If she stumbles or seems unsteady on her feet, that's a sign the solanine is impacting her nervous system. Keep her confined where you can observe any changes in movement or behavior.
What to check in the first six hours
Focus on her gums and breathing patterns. Solanine can cause inflammation, making her gums appear brighter red than usual. Any rapid panting or open-mouth breathing in a cat is unusual and warrants an immediate vet call, as it suggests discomfort or early systemic effects.
While waiting, remove all plant material from her reach—cats often return to nibble more after the first taste. Offer a small amount of water to help flush any residual irritants from her mouth, but don't force it if she resists. Her appetite may temporarily decrease due to nausea.
When the risk shifts from irritation to toxicity
A single small leaf rarely causes severe poisoning in a cat this size, but repeated nibbling escalates the danger. If you've seen her chew tomato plants before, even days ago, mention this to the vet. Cumulative exposure can tip the scales toward muscle weakness or dilated pupils.
Contrast this with a green tomato: eating one marble-sized fruit might only cause mild drooling. The plant's stems and older leaves are the real concern—they contain up to ten times the solanine of immature fruit. Note whether she targeted tender new growth or tougher mature leaves.
Why you shouldn't wait for vomiting
Cats often don't vomit after plant ingestion, unlike dogs. By the time she throws up, significant toxin absorption may have already occurred. Instead, watch for subtler signs like excessive licking of lips or unusual hiding behavior, which indicate discomfort.
If she develops diarrhea later, check for blood or mucus—these suggest intestinal irritation from the toxins. Hydration becomes critical at this stage, especially since cats dehydrate quickly. Lift the skin at her shoulders; if it doesn't snap back promptly, she needs veterinary fluid support.
The step-by-step response, from the first minute to the vet visit, is in our Tomato & Potato Plants (Solanine) emergency guide.