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Hello. My dog, Henry, is a 10-yr-old boxer who has recently been having some problems.? - list of walk in clinics toronto

A few days ago he began acting very lethargic. He had balance problems and tends to the left, while walking list. He shuddered at the touch of the head / face protection and a lower seizures had. He eats very well, but it raises the water you drink in a few minutes to drink. Questions of incontinence (sp?).
We took him to the vet on Thursday and said it was probably meningitis, epilepsy or a brain tumor, then bring in a neurological clinic in the morning to have a lumbar puncture.
I wonder if anyone else has seen these symptoms in your dog, and what came to be.