Join Date: Mar 2016
Location: Katy, TX
Dogs Name: Gator
Dogs Age: 11 weeks
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I'm not a vet but I have worked in the medical field for many years. This really sounds like it's neurological, based on his symptoms and behaviors. Cardiac issues wouldn't cause this kind of neurological symptoms. You may want to buy a thermometer specifically for him and take his temperature at different times of the day to make sure it's within normal range,and keep a record of them.
Also, is he on a natural food diet? Some uncooked meats can cause illnesses or parasites that cause neurological symptoms, as well as vegetables that may have been treated with pesticides, if not thoroughly washed.
Good luck, and I hope your Burnaby is ok.