Lethargic Dog or Cat: When Should You Worry?

Lethargy is one of the most common — and most easily missed — signs that a pet is unwell. Cats and

dogs tend to hide pain, so even a small change in energy is worth paying attention to.

Normal tiredness or a sign of illness?

A pet who sleeps more after a busy day of play, after a vaccine, or on a hot day usually bounces back quickly. What to watch for is tiredness that's unusual for your pet, lasts a long time, or comes with other symptoms.

Check these things

• Is your pet still eating and drinking?

• Any vomiting, diarrhea, or coughing?

• How is their breathing — normal, fast, or heavy panting?

• What colour are their gums — the usual pink, or pale/bluish?

• Are they peeing and pooping as usual?

• Could they have swallowed something toxic, overheated, or recently had a vaccine?

Emergency signs: don't wait

Contact us right away or go straight to the nearest 24-hour emergency vet if your pet:

• Collapses, is unconscious, or is severely disoriented

• Has trouble breathing — a cat breathing with its mouth open, heavy panting, or pale/bluish gums

• Is weak after heat exposure, with heavy panting, drooling, or vomiting (possible heatstroke)

• Is weak after possible poisoning

• Suddenly weakens with facial swelling or hives, for example after a vaccine or insect sting

• Can't pee, especially male cats

Get checked soon if:

• Lethargy comes with repeated vomiting or vomiting blood

• Lethargy comes with not eating for more than 24 hours

• Lethargy with a swollen or painful belly

• Lethargy doesn't improve within a day

Help from Modernvet:

Not sure if your pet needs to be seen? Contact the Modernvet team through the app or WhatsApp — we'd rather assess and rule out an emergency than miss something serious. Book an appointment in the Modernvet app for an exam.