I am unsure but a friend of mine's dog, a Pug named **, started flinching. At first I thought he didn't like me but then I realized he will not stop flinching. He also cannot stand up straight or walk straight. He kind of stumbles like a drunk person would. This dog has never been hit or abused.
He needs to see a vet.
His flinching could be either a sign of pain, or a nervous system problem, or both.
On the other hand, this could possibly be an inner ear infection.
But whatever it might be, the only person who can find out for your friend, is the vet. See if you can persuade your friend to take him very soon.
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