Can I leave my Tibetan Spaniel alone for long periods?

No, because they like to be with their families, but can be left for a few hours once they are used to it. Check out the guidance on training puppies at the Kennel Club website https://www.thekennelclub.org.uk/getting-a-dog-or-puppy/general-advice-about-caring-for-your-new-puppy-or-dog/puppy-environment/