Sadie's additional bloodwork came back, confirming a diagnosis of hypothyroid. Her TSH reading was not just slightly high but very significantly high, so she is now on Thyroxine for the rest of her life. It may be 4-6 weeks before there are observable changes such as more energy and loss of weight, and we will test again at that time to ensure we have her on the correct dose. We'll also check her ALT liver count again at that time, as it was slightly on the high side as well.
Sadie's very slow heart rate is also a symptom of hypothyroid, and when the heart rate drops too low and there is a lack of blood flow to the brain, an Ischemic stroke can occur - that may be what happened Thursday night.
Alternatively, an interesting aspect of hypothyroidism is that it can present as peripheral nerve damage, with a weakened back end or loss of limb control. Without subjecting Sadie to further tests such as CT scan or MRI, we shall likely never know if Sadie actually had a stroke the other day or if it was nerve problems. Either way, getting the hypothyroid under control should decrease the risk of another incidence.
And it will be nice to see Sadie get her energy back and resume her play activities with the other dogs. Who knows - there may be a monster-dog hiding inside that soft, sweet, quiet, calm furry coat!