Some of this is not a training problem, and treating it like one wastes time your dog may not have. If they are distressed when you leave, if they growl or guard their food, their toys or you, if they are frightened on the lead, or if anything about them changes suddenly at any age, contact your vet the same day. A tip from a website, ours included, is not the answer. If it cannot wait, contact your nearest emergency vet now.
With a Canaan Dog, watch their skin, their hips and their voice. Licking their paws for hours, chewing their legs or rubbing their face on the floor can be allergies. Not wanting to jump into the car, or sitting down on walks, can be the hips. And a Canaan who stops announcing the door, or starts barking at nothing at night as they get older, has changed for a reason worth finding. Bloat (GDV, a twisted stomach) can happen in any dog, though it is most common in large, deep-chested breeds. A swollen, tight belly, retching with nothing coming up, sudden restlessness or drooling is an emergency: contact your vet now.
She'll keep digging for the cool spot. If she stops getting up out of it, call your vet.