There are diseases, illness, and conditions that can either have potential to cause ME or they occur in addition to the ME. Below is a list of those most common over the years again relative to our ME dogs. Have placed a link behind each for ease in becoming educated to these:

Some of the most prevalent:
Addison’s Disease https://www.petmd.com/dog/conditions/endocrine/c_dg_hypoadrenocorticism
Antibiotic Responsive Gastritis (ARG) https://www.vetinfo.com/antibiotics-for-gastritis-in-dogs.html
Arthritis https://www.petmd.com/dog/conditions/musculoskeletal/c_multi_polyarthritis_nonerosive_immune_mediated
Aspiration Pneumonia (AP) https://www.petmd.com/dog/conditions/respiratory/c_multi_pneumonia_aspiration
Blind https://www.petmd.com/dog/conditions/eyes/c_dg_blind_quiet_eye
Bloat https://www.petmd.com/dog/conditions/digestive/c_dg_gastric_dilation_volvulus_syndrome
Cancer https://www.petmd.com/dog/conditions/cancer/what-do-when-your-dog-diagnosed-cancer-treatment-prognosis-and-aftercare
Centronuclear Myopathy (CNM) https://www.vgl.ucdavis.edu/services/dog/CNMLabrador.php
Degenerative  Myelopathy  (DM) http://www.caninegeneticdiseases.net/DM/basicDM.htm
Diabetes https://www.petmd.com/dog/conditions/endocrine/c_dg_diabetes_mellitus
Diaphragmatic Hernia https://www.petmd.com/dog/conditions/cardiovascular/c_multi_diaphragmatic_hernia
Distemper https://www.petmd.com/dog/conditions/respiratory/c_dg_canine_distemper
Esophageal Dysmotility https://www.merckvetmanual.com/digestive-system/diseases-of-the-esophagus-in-small-animals/esophageal-dysmotility-in-small-animals
Exocrine Pancreatic Insufficiency (EPI) https://www.merckvetmanual.com/digestive-system/the-exocrine-pancreas/exocrine-pancreatic-insufficiency-in-small-animals
Geriatric Vestibular Syndrome (GVS) https://www.vetinfo.com/canine-geriatric-vestibular-disease-symptoms.html
Giardia https://www.petmd.com/dog/conditions/infectious-parasitic/c_multi_giardiasis
Hearing Loss https://www.petmd.com/dog/conditions/ears/c_multi_Deafness
Heart Murmur https://www.petmd.com/dog/conditions/cardiovascular/c_dg_heart_murmur
Heartworms https://www.petmd.com/dog/conditions/infectious-parasitic/c_dg_heartworm_disease
Hemangiosarcoma https://www.petmd.com/blogs/fullyvetted/2012/july/hemangiosarcoma_in_dogs-26511
Kennel Cough https://www.petmd.com/dog/conditions/respiratory/c_dg_canine_tracheobronchitis
Laryngeal Paralysis (LP) https://www.petmd.com/dog/conditions/respiratory/c_dg_laryngeal_disease
Leukemia https://www.petmd.com/dog/conditions/cancer/c_multi_acute_lymphoblastic_leukemia
Lower Esophageal Stricture (LES) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC340085/
Lyme Disease https://www.petmd.com/dog/conditions/infectious-parasitic/c_dg_lyme_disease
Lymphoma https://www.petmd.com/dog/conditions/cancer/c_dg_lymphoma
Myasthenia Gravis (MG) https://www.vetinfo.com/dmyasthenia.html
Neonatal Esophageal Dysfunction (NED) http://veterinarymedicine.dvm360.com/recognizing-and-treating-esophageal-disorders-dogs-and-cats
Parvo https://www.petmd.com/dog/conditions/infectious-parasitic/c_dg_canine_parvovirus_infection
Patent Ductus Arteriosus (PDA) https://www.petmd.com/dog/conditions/cardiovascular/c_multi_patent_ductus_arteriosus
Persistent Right Aortic Arch (PRAA) http://www.vetstreet.com/care/persistent-right-aortic-arch-vascular-ring-anomaly-in-dogs-and-cats
Ringworms https://www.petmd.com/dog/conditions/skin/c_dg_dermatophytosis
Seizures (Epileptic) https://www.petmd.com/dog/conditions/neurological/c_dg_seizures_convulsions
Separation Anxiety https://www.petmd.com/dog/conditions/behavioral/c_dg_separation_anxiety
Thymoma https://www.petmd.com/dog/conditions/endocrine/c_dg_tumor_thymus
Torsion https://vethelpdirect.com/vetblog/2011/03/16/gastric-torsion-in-dogs/
Urinary Tract Infection (UTI) https://www.petmd.com/dog/conditions/urinary/c_dg_lower_urinary_tract_infection_bacterial
Vascular Ring Anamoly (VRA) https://www.petmd.com/dog/conditions/digestive/c_dg_vascular_ring_anomalies