Pug Puppy not walking properly

Hi,

My 5.5 month old pug, Frank, is not walking properly - he seems to be unstable on his feet.??
We took him to the vet, who checked him out and said it could be neurological disorder, perhaps he hurt his head when he was younger? But the strange this is that he wasn't always like this, this has started doing this the last 3 weeks.
What could be wrong with him?
Please help.

[Dr. Carol Osborne, DVM]

I would have complete blood and urine tests run first then seeing a veterinary neurologist may be helpful. You might ask your vet to rule out a middle/inner ear problem as this can cause balance issues which may or may not be the case for your dog.
Dr Carol Osborne, DVM