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- Sick Sinus Syndrome in Dogs
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- Fainting – without any other warning, signs or symptoms your dog may lose consciousness, this may happen after your dog’s heart stops for 8 seconds or more
- Lethargy – you may notice your dog has an overall weakness and lack of energy with no explanation
- Bradycardia – an irregularly slow heartbeat, for dogs this would be anything below 40 beats per minute
- Tachycardia – an irregularly fast heartbeat, this would not be explained by exercise or any other causes and could be over 200 beats per minute
- Asymptomatic – your dog may present with no noticeable symptoms to you and only upon a visit to his veterinarian will sick sinus syndrome be caught
- Abnormally slow heart rate
- Typical heart rate for a dog is around 40 beats per minute
- With sick sinus syndrome, this can go as low as 10 beats per minute
- Abnormally high heart rate
- Typical heart rate for a dog at rest is around 40 beats per minute and can go up to the high 200’s per minute when he is involved with intense exercise or play
- With sick sinus syndrome, your dog at rest could have a heartbeat of 200+
- West Highland White Terriers
- Dachshunds
- Miniature Schnauzers – females tend to inherit this syndrome more than males do
- Boxers
- Cocker Spaniels
- Adult dogs tend to show signs of the syndrome more so than puppies or young dogs
- Older dogs have a higher risk of developing symptoms as they age versus their younger counterparts
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