How body weight changes the math
That tablespoon represents 15 ml — for your 5 kg terrier, that's 3 ml per kilogram coursing through his system. Your Labrador would need to ingest 90 ml to face equivalent concentration, nearly a quarter cup. Smaller dogs have proportionally larger lung surface area relative to body mass, meaning more tissue contacts the vaporized chemicals.
The terrier's higher metabolic rate accelerates absorption but lacks sufficient liver enzymes to neutralize hydrocarbons efficiently. Expect symptoms to manifest within 10-15 minutes versus potentially hours in the larger dog. Watch his chest movements for shallow, rapid breaths instead of normal panting rhythm.
Airway size dictates emergency signs
Narrower tracheas and bronchioles in small breeds mean swelling from chemical burns obstructs airflow faster. The terrier may develop a honking cough followed by blue-tinged gums as oxygen drops. Foamy discharge appears when the thinner mixes with lung surfactant, creating bubbles that further block tiny airways.
Your Labrador could ingest the same volume with milder initial signs — perhaps some lip-licking and temporary loss of appetite. But don't assume safety; large dogs still risk delayed-onset pneumonia as the chemicals migrate deeper into lung tissue over 6-12 hours. Both need veterinary assessment, but the terrier can't wait.
Why small dogs decompensate faster
Five kilograms of body weight means limited glycogen reserves to sustain organ function under chemical stress. Hypoglycemia often complicates petroleum distillate poisoning in toy breeds, causing weakness or seizures unrelated to the toxin's direct effects. The terrier may suddenly sit down mid-walk or fail to recognize familiar commands.
Small dogs also lose heat rapidly when struggling to breathe, leading to dangerous drops in core temperature. Feel his ears and paws — if cooler than usual despite warm surroundings, his circulatory system is prioritizing vital organs. Wrap him in a blanket (not heated) during transport to slow heat loss.
Immediate steps for both scenarios
Prevent further grooming by gently wiping the terrier's face with a damp cloth, especially around whiskers where thinner clings. Don't induce vomiting — the risk of re-aspiration outweighs any benefit. Offer ice cubes to lick rather than a full water bowl, as excessive drinking could spread the chemicals.
For the Labrador, check gum color every 30 minutes even if asymptomatic. Brick-red gums suggest carbon monoxide formation from metabolized hydrocarbons. Both dogs need separate confinement to prevent cross-contamination through licking or shared bedding. Remove collar tags that might clank and startle the terrier during respiratory distress.
The step-by-step response, from the first minute to the vet visit, is in our Petroleum Distillates Poisoning in Dogs and Cats emergency guide.