Why 6 kg changes everything with snake venom
A snake injects roughly the same venom amount into any dog, but a terrier's tiny body can't dilute it like a Labrador's can. Think of pouring salt into a teaspoon versus a bucket—the smaller the container, the stronger the concentration. For your 6 kg dog, this means faster absorption into their bloodstream, with symptoms like weakness or labored breathing appearing within minutes rather than hours.
The terrier's small veins and muscles also suffer more physical damage from the venom's tissue-destroying enzymes. Swelling around the bite site may obstruct their airway or blood flow quicker than in the Lab. Even if both dogs were bitten by the same snake, the terrier's crisis timeline accelerates exponentially due to their size.
Movement makes venom spread—handle the terrier first
Since the venom is already hitting the terrier harder, keeping them still is critical. Every step they take pumps the toxins toward their heart. If you must move them, cradle their body with full support—never let them walk or scramble. Loosen their collar immediately; neck swelling can strangle a small dog within 10 minutes.
While the Labrador also needs care, their larger mass buys time. Have someone else guide the Lab to the car while you prioritize stabilizing the terrier. Avoid the instinct to let either dog drink water—this increases blood flow and venom circulation when you need to slow both down.
What to watch for in the next 30 minutes
With the terrier, monitor gum color—if pink turns white or purple, their circulatory system is collapsing. Small dogs dehydrate rapidly from venom-induced shock, so check for tacky gums or delayed skin tenting. Whining or sudden lethargy are red flags; their petite nervous system reacts intensely to neurotoxins.
The Lab may seem fine initially, but don't be fooled—their symptoms often manifest as internal bleeding rather than obvious pain. Look for unexplained bruising on their belly or blood in their urine. Big dogs sometimes hide distress until their condition deteriorates rapidly, so insist on veterinary evaluation for both.
Why you can't wait for symptoms to appear
By the time a small dog shows obvious distress—vomiting, tremors, dilated pupils—their organs may already be failing. Venom attacks their limited blood volume and oxygen supply faster than a big dog's reserves can deplete. Waiting to "see how they do" risks missing the narrow window for antivenom to work.
Even if the Lab acts normal, their kidneys could sustain hidden damage from filtering venom meant for a body five times their size. Some snake toxins cause delayed muscle breakdown that peaks 12–24 hours later. Immediate vet care isn't overreacting—it's recognizing that size dictates urgency.
The step-by-step response, from the first minute to the vet visit, is in our Snake Bites (Viper & Pit Viper) emergency guide.