The fainting will happen for a few seconds to a few minutes depending on how fast the dog’s heart corrects itself.
It should be noted, that for young puppies, particularly under the age of 6 months, fainting can be the sign of hypoglycemia...a rapid, dangerous drop in blood sugar levels (treated by rubbing Karo syrup directly onto the pup's gums for rapid transport into the bloodstream and then bringing him or her to the closest vet or animal hospital)....Therefore, any collapse or fainting must be treated immediately.
Each case is different. However some Boxer dogs with cardiomyopathy will reach a point where the ventricles of the heart expand. This causes the walls of the heart to become too thin and the heart itself will decline in strength.
Coughing may occur at this point. Owners should not panic if coughing occurs, as it may be something as simple as allergies...However, it is important to have it checked out as soon as possible.
How is this Diagnosed?
How do you know if your Boxer has cardiomyopathy (arrhythmia)? This is a part of why this canine disease can be so tricky. There is usually no symptoms during early stages. This is usually found during a routine vet visit. For this reason, we strongly encourage all owners to keep up with regularly scheduled visits, even if your Boxer seems very healthy.
The heart arrhythmias are not always identified by using a stethoscope. It all depends on the actual frequency of the abnormal heart rhythm.
Usually, the cardiomyopathy will cause an extra heart beat or a skipped beat and it must occur without a corresponding pulse in order to be deemed cardiomyopathy arrhythmia. If the frequency is just right, a veterinarian will be able to detect this during a normal checkup.
As your Boxer grows older, he or she will reach an age of having geriatric visits...This means that the regular testing will change a bit...And part of this is to take more time to listen to the heart beat. Be sure to discuss this with your dog's veterinarian.
Normally, your dog’s veterinarian will use 1 hand to hold the stethoscope and 1 hand is put on the dog’s hind leg to feel their pulse. Why on the hind leg? This area contains a large femoral artery which vets find one of the best areas to properly feel a dog’s pulse.