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 Pomsky, listen to their breathing and watch their back legs. A honking cough, especially when they are excited or pulling, can be their windpipe. Skipping for a few steps on a back leg can be a kneecap slipping. Pawing at their mouth or dropping food can be their teeth. Scratching and licking their paws can be allergies. 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. It is easy to put the rest down to character, and that can cost months.
Whichever one wakes up, they'll want their walk. If they don't, call your vet.