[MorkieMomma]

Could it possibly what they call Small Dog Syndrome? It sounds like it might be the beginnings of it to me (but I'm definitely no expert).

Here are some links about it:

Toy Breeds And Small Dog Syndrome CBS Philly

How to Prevent/Reverse Small Dog Syndrome - AllPetNews

Small Dog Syndrome - what is small dog syndrome?

Responsible Pet Ownership Blog: How to Deal With Small Dog Syndrome

Small Dog Syndrome and how to fix it | Dog Training Tricks