Your pet is part of the family – which is why it can be scary when something doesn’t feel quite right. They’re not just animals; they’re alarm clocks, cuddle buddies, and emotional support all rolled into one. But unlike humans, they can’t tell us when they’re feeling off. That’s why learning to spot the subtle signs your pet is sick could make all the difference.
1. Loss of Appetite
If your pet suddenly loses interest in their favourite meals or treats, it could be a sign of an underlying health issue. Track changes over 24–48 hours and contact your vet if it continues. It might indicate digestive issues, dental pain, stress, or more serious concerns.
2. Low Energy or Lethargy
Most pets are naturally active and playful, so if they become unusually tired, it’s worth noting. Watch for excessive sleeping, slow movement, or lack of interest in walks or play. While some breeds are naturally relaxed, any extreme drop in energy should be monitored.
3. Behavioural Changes
A sudden shift in behaviour – such as aggression, withdrawal, or anxiety – can signal discomfort or illness. Just like us, animals may act grouchy when they’re in pain. A normally friendly pet that snaps or hides away might be dealing with something serious.
4. Changes in Grooming Habits
Cats are meticulous groomers, so a lack of grooming or over-grooming is a sign to watch. Dogs may also lick or bite areas that are sore. These habits often point to stress, skin issues, or underlying pain.

5. Physical Symptoms
Physical signs are the most obvious warning flags. These include:
– Vomiting
– Diarrhoea
– Sneezing or coughing
– Noticeable weight loss
If these symptoms last more than 24 hours, consult your vet immediately.
6. Unusual Smells
Bad breath, foul-smelling ears, or unusual body odours can indicate infections, dental disease, or skin conditions. Trust your instincts – if something smells off, it could be a sign of a deeper problem.
7. Regular Check-ups Matter
Routine vet visits are essential to catch problems early. Many conditions are more manageable (and affordable) when caught before they become serious. Prevention is always better than cure.
Frequently Asked Questions
- Q: How do I know if my pet is just tired or actually ill?
A: Temporary tiredness is normal, but consistent low energy or disinterest in normal activities warrants a vet visit.
- Q: My dog skipped a meal – should I worry?
A: A skipped meal isn’t always serious, but if it happens more than once or is paired with other symptoms, check with your vet.
- Q: Can stress make my pet act sick?
A: Yes. Stress can affect eating, grooming, and behaviour. Environmental changes or loud noises can have an impact.
- Q: When should I take my pet to the vet?
A: If symptoms last more than 24 hours, worsen rapidly, or involve pain, vomiting, or lethargy – seek help immediately.
- Q: I want more advice
A: Check out the RSPA website
🐾 Think you see the signs your pet is sick? Don’t wait – book a vet check-up today or visit your local pet supplies shop for trusted advice. Want more expert tips? Explore our full Pet Library for everything pets.