Johnny graduated from Aristotle University of Thessaloniki, Greece in 2005 and spent three years working as a general practitioner in England before starting a rotating internship at Queen’s Veterinary School Hospital, University of Cambridge. In 2011 he began a residency in Neurology and Neurosurgery at the Royal Veterinary College and in 2014 after successfully passing his exams, he was awarded the Diploma of the European College of Veterinary Neurology (ECVN). Johnny joined Davies Veterinary Specialists in the same year and in 2021 he became the head of the Neurology & Neurosurgery Service. Johnny enjoys dealing with many aspects of Neurology and Neurosurgery, he has been the main author and co-author of numerous publications and he lectures in the UK and abroad. Outside work, Johnny has a passion for gardening, learning foreign languages, travelling and spending quality time with his pets; Chilli -the naughty Terrier- and Mochi the cat, who is always on his lap purring.

“I enjoy working in a friendly and supportive environment, with state-of-art facilities and exceptional standards of care towards our patients and clients. Supportive care for neurological patients is paramount and it’s reassuring to know that all our patients are treated in the best possible way, as if they were our own pets.”

Publications

-Comparison of Survival After Treatment of Presumed Intracranial Meningioma by Radiotherapy or Surgery in 285 Dogs
R Geiger, J Mankin, HA Volk, S de Decker, N van Asselt, K Randhawa, …
Journal of Veterinary Internal Medicine 39 (2), e70011, 2025

-Medial strabismus (esotropia) at rest associated with contralateral paramedian thalamic ischemic infarction in 2 dogs
T Liatis, IN Plessas, H Volk, D Whittaker
Journal of Veterinary Internal Medicine 38 (2), 1146-1151, 2024

-Clinical presentation, diagnostic findings and outcome of dogs undergoing surgical resection for intracranial meningioma: 101 dogs
AK Forward, HA Volk, GB Cherubini, T Harcourt-Brown, IN Plessas, …
BMC veterinary research 18 (1), 88, 2022

-Evaluation of paraspinal musculature in small breed dogs with and without atlantoaxial instability using computed tomography
A Müller, F Forterre, B Vidondo, MH Stoffel, Á Hernández-Guerra, …
Veterinary and Comparative Orthopaedics and Traumatology 35 (05), 305-313, 2022

-Determination of cutoff values on computed tomography and magnetic resonance images for the diagnosis of atlantoaxial instability in small‐breed dogs
B Planchamp, F Forterre, B Vidondo, AM Hernandez‐Guerra, IN Plessas, …
Veterinary Surgery 51 (4), 620-630, 2022

-Focal tetanus involving both thoracic limbs successfully treated with magnesium sulfate in a dog
E Royaux, IN Plessas, P Smith
Vlaams Diergeneeskundig Tijdschrift 89 (4), 2020

-Retrospective evaluation of the clinical presentation, magnetic resonance imaging findings, and outcome of dogs diagnosed with intracranial empyema (2008–2015): 9 cases
AK Forward, IN Plessas, S Guilherme, S De Decker
Journal of Veterinary Emergency and Critical Care 29 (4), 431-438, 2019

-Craniovertebral junction anomalies in small breed dogs with atlantoaxial instability: A multicentre case–control study
MA Waschk, B Vidondo, I Carrera, AM Hernandez-Guerra, P Moissonnier, …
Veterinary and Comparative Orthopaedics and Traumatology 32 (01), 033-040, 2019

-Clinical presentation and magnetic resonance imaging findings in a juvenile dog with unilateral hydrocephalus and presumed periventricular encephalitis
R Salgüero, IN Plessas
Vlaams Diergeneeskundig Tijdschrift 86 (5), 2017

-Comparison of gabapentin versus topiramate on clinically affected dogs with Chiari‐like malformation and syringomyelia
IN Plessas, HA Volk, C Rusbridge, AE Vanhaesebrouck, ND Jeffery
Veterinary Record 177 (11), 288-288, 2015

– Signalment, Clinical Signs And Treatment Of Atlantoaxial Subluxation In Dogs: A Systematic Review Of 336 Published Cases From 1967 To 2013.
IN Plessas, HA Volk Journal of Veterinary Internal Medicine 28 (3), 948, 2014

-Migraine-like Episodic Pain Behavior in a Dog: Can Dogs Suffer from Migraines?
IN Plessas, HA Volk, PJ Kenny
Journal of Veterinary Internal Medicine, 2013

-A case of canine discospondylitis and epidural empyema due to Salmonella species
IN Plessas, P Jull, HA Volk
The Canadian Veterinary Journal, 595, 2013

-Long‐term outcome of Cavalier King Charles spaniel dogs with clinical signs associated with Chiari‐like malformation and syringomyelia
IN Plessas, C Rusbridge, CJ Driver, KE Chandler, A Craig, IM McGonnell, …
Veterinary Record 171 (20), 501-501, 2012

-Temporal lobe epilepsy in a cat with a pyriform lobe oligodendroglioma and hippocampal necrosis
AE Vanhaesebrouck, B Posch, S Baker, IN Plessas, AC Palmer, …
Journal of Feline Medicine and Surgery 14 (12), 932-937, 2012

-Neuromyotonia in a dachshund with clinical and electrophysiological signs of spinocerebellar ataxia
AE Vanhaesebrouck, SF Bhatti, IE Polis, IN Plessas, LM Van Ham
Journal of Small Animal Practice 52 (10), 547-550, 2011