Dogs with internal injuries often show a combination of subtle and obvious signs: pale or white gums, a swollen or tense belly, labored breathing, extreme lethargy, or an inability to get comfortable. The tricky part is that some internal injuries don’t produce visible symptoms right away. A dog can walk around and seem fine after a fall or car accident, then deteriorate hours or even days later as internal bleeding, a collapsed lung, or a hernia worsens. Knowing what to watch for in the first few days after any trauma can make the difference between catching a problem early and missing it entirely.
Check the Gums First
Your dog’s gum color is one of the fastest and most reliable indicators of what’s happening inside the body. Healthy gums are pink and moist. If they look white, gray, or bluish, that signals poor circulation, blood loss, or shock. You can also test capillary refill time by pressing a finger firmly against the gum for a second, then releasing. The spot should return to pink within one to two seconds. If it takes longer than two seconds, blood isn’t circulating properly, and your dog needs emergency veterinary care.
Cold paws and ears alongside pale gums strengthen the case that your dog is losing blood internally or going into shock. These signs together point to the body redirecting blood flow away from the extremities to protect vital organs.
Abdominal Warning Signs
Internal abdominal injuries, whether from blunt trauma, a fall, or being hit by a car, often show up as a combination of physical and behavioral changes. A visibly swollen or distended belly is one of the clearest red flags, especially if it develops or worsens over hours. The swelling can come from internal bleeding, fluid accumulation, or organ damage.
Dogs with abdominal pain tend to adopt specific postures. One of the most recognizable is the “prayer position,” where the dog drops its front legs and chest to the ground while keeping the hindquarters raised. An arched back, reluctance to lie down, or guarding the belly when you try to touch it are equally telling. You may also notice vomiting, diarrhea, drooling, retching without producing anything, or a complete refusal to eat. Any of these signs after a known injury warrants immediate attention.
Breathing That Doesn’t Look Right
Chest injuries from trauma can cause fluid buildup, broken ribs, or a collapsed lung, all of which change how a dog breathes. Watch for shallow, rapid breaths, visible effort to inhale or exhale, or a breathing pattern where the chest and belly seem to move in opposite directions (the chest sucks inward while the belly pushes out on an inhale, then reverses). This paradoxical movement is a hallmark of chest wall injury or pressure building in the space around the lungs.
A dog that insists on sitting upright or standing and resists lying on its side may be doing so because a chest injury makes it harder to breathe in that position. Rapid breathing at rest is significant on its own. A normal resting respiratory rate for dogs is 18 to 34 breaths per minute. If your dog is consistently breathing faster than that while calm, something is wrong internally.
Behavioral Changes That Signal Pain
Dogs are hardwired to hide pain, which makes behavioral shifts one of the most important clues to internal injury. According to Cornell University’s veterinary program, the key signs to watch for include unusual lethargy or unwillingness to move, uncharacteristic snapping or growling when approached or touched, and altered posture like carrying the head low or holding the tail abnormally. A dog that suddenly becomes aggressive when it’s normally gentle isn’t being “bad.” It’s telling you something hurts.
Restlessness is just as concerning as lethargy. A dog that can’t settle, keeps shifting positions, pants heavily, or whimpers without an obvious cause may be dealing with internal pain it can’t escape. Hiding or withdrawing from the family, especially in a normally social dog, is another signal worth taking seriously.
Signs of Head or Spinal Injury
If trauma involved a blow to the head, a fall from height, or impact with a vehicle, watch for neurological symptoms. These include walking in circles, a persistent head tilt, eyes that flick rapidly back and forth, pupils that are different sizes, or a wobbly and uncoordinated gait. A dog that seems confused, doesn’t recognize you, or stares blankly may have a traumatic brain injury. Inability to stand or move the hind legs after trauma suggests a spinal injury.
The Stages of Shock
Internal bleeding or organ damage can send a dog into shock, which progresses through stages. Recognizing these stages gives you a sense of how urgent the situation is.
- Early (compensatory) shock: The heart races above 180 beats per minute as the body tries to compensate for blood loss. Body temperature drops to the low end of normal, around 98 to 99°F. Gums may appear slightly pale.
- Worsening (early decompensatory) shock: Temperature drops further to 96 to 98°F. The heart is still racing but gums are noticeably pale, and the dog becomes increasingly weak and lethargic.
- Late-stage shock: Body temperature falls below 96°F, and paradoxically, the heart rate slows. The gums may be white or gray. This stage is life-threatening and requires immediate emergency care.
A normal resting heart rate for dogs is 70 to 120 beats per minute, with smaller dogs naturally running higher. You can check it by placing your hand on the left side of the chest, just behind the elbow. If the heart feels like it’s pounding unusually fast and your dog shows other signs on this list, don’t wait.
Symptoms Can Be Delayed by Days
One of the most dangerous aspects of internal injuries is the delay between trauma and visible symptoms. VCA Animal Hospitals notes that dogs can appear completely normal after a fall, walking and playing as usual, only to become lethargic, weak, or short of breath hours or days later. Specific delayed injuries include a lung that slowly collapses as a broken rib punctures it over time, or a small hernia that gradually tears open.
If your dog experienced any kind of significant impact, even if it seems perfectly fine afterward, monitor it closely for at least 48 to 72 hours. Watch for any of the signs described above, and pay particular attention to energy levels, appetite, gum color, and breathing rate. A subtle decline is easier to catch when you’re actively looking for it.
How to Safely Move an Injured Dog
If you suspect internal injuries, how you handle your dog on the way to the vet matters. Rough handling can worsen internal bleeding, shift broken bones, or aggravate spinal damage. The core principles are simple: handle as little as possible, move gently, and minimize bending of the spine.
For a dog that can’t walk or may have a spinal injury, slide it onto a rigid flat surface like a board, large cutting board, or even a sturdy piece of cardboard, keeping the back and neck straight. Gently secure the dog with tape or strips of fabric so it can’t thrash and injure itself further. If the dog resists being placed on a board, a large blanket can serve as a makeshift stretcher with two people holding the edges. Smaller dogs can go in a carrier or cardboard box.
A few additional guidelines that can prevent further harm:
- Don’t press on the stomach, especially if the belly seems swollen or the dog is vomiting.
- Let the dog choose its position if it resists lying on its side. Chest injuries can make side-lying unbearable.
- Keep the head level with the body for unconscious dogs. Bending the neck too far up or down can impair blood drainage from the brain.
- Tilt the head slightly downward if the dog has vomited or might vomit, so fluid drains out of the mouth rather than into the airway. Dogs with head injuries often vomit even while unconscious.
- Cover the dog with a blanket. This prevents heat loss, which accelerates shock, and has a calming effect.
What Happens at the Vet
Once you arrive at an emergency clinic, one of the first things the veterinary team will likely perform is an ultrasound scan called a FAST exam (focused assessment with sonography for trauma). This is a quick, noninvasive scan of the abdomen and chest that detects free fluid, which is often blood, in body cavities. It can be done within minutes of arrival, even while other stabilization is happening. The technique is highly accurate, with studies showing it correctly identifies internal fluid 81 to 98% of the time. It can also help pinpoint which organ is damaged and guide further treatment decisions like surgery or blood transfusions.
The speed of this exam is its biggest advantage. Your vet doesn’t need to wait for bloodwork to come back or schedule imaging to confirm internal bleeding is happening. The sooner internal injuries are identified, the better the odds of a good outcome.