A concussion is serious bruising of the brain; it generally renders the sufferer unconscious. Dogs and humans are both susceptible to concussions. If you see the symptoms of a concussion in your dog, consult a vet immediately.
A contusion is a bruise on the brain that does not knock the dog unconscious. It is a minor injury similar to a concussion that leaves the dog disoriented and causes trouble walking. Usually, dogs snap out of it on their own, but you should consult a vet.
A concussion is a more serious injury than a concussion; it knocks a dog unconscious. The longer a dog’s out, the more serious the concussion. Minor concussions last minutes; serious ones can last days. A concussion is an emergency that requires a vet.
Contusions and concussions can scar the brain, leading to seizures. Mild seizures can show up as twitching, unusual blinking or a dazed look. Major seizures can make a dog collapse or foam at the mouth. These can happen weeks after a head injury.
Dogs may develop other symptoms too. If you see that one pupil is larger or less responsive to light than the other, or paralysis in one or more limbs, your dog has a serious brain injury.