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Background: Urinary proteome is a topic not deeply investigated in dogs. Leishmaniasis (L) and Cushing’s Syndrome (CS) are frequently associated with persistent proteinuria. Evaluation of urine proteome with sensitive methods is considered a non invasive procedure to monitor the therapy and select novel biomarkers. Objectives: Comparison of urinary electrophoretic profiles between healthy (H) and diseased dogs (L, CS) at the time of diagnosis and during the treatment monitoring. Methods: Urine samples were collected from 49 dogs (12 H, 26 L, 11 CS) and Urine Protein and Albumin to Creatinine ratios (UPC, UAC), HRE and SDS-PAGE were performed. Electrophoretic profiles were analyzed by ImageJ©; proteins were identified by ESI-Q-TOF. Results: UPC and UAC (mean±SD) were significantly higher (p

Urine samples were collected from 66 feline hospital admissions by cystocentesis or free catch, and analyzed (UPC, HRE). Within-assay imprecision for high (H), medium (M) and low (L) concentrations, between-assay imprecision, linearity/accuracy and percentage recovery were determined for albumin. Albumin was assessed by urine to creatinine ratio (UAC), percentage (ALB%) and mg/dl (ALB mg/dl). Cases were categorized: a) as chronic kidney disease with (CKDC) and without complications (CKD), feline lower urinary tract disease (FLUTD) or other, and b) as proteinuric (P), borderline proteinuric (BP), or not proteinuric (NP), and c) by type of sediment active (A) or not active (NA). Results: HRE within-assay CV was 2.58%(H), 5.31%(M), 3.42%(L), between-assay CV was 3.52%, recovery percentage was 97%, 93% and 109% for high, medium and low concentration, respectively, and linearity was high (r=0.99). Compared with UPC at different cut-off values, HRE showed higher specificity and PPV but lower sensitivity and NPV than dipstick to measure proteinuria. Dipsticks showed frequent false positives compared with HRE. Based on UPC, measures of albuminuria were higher in proteinurics than non-proteinurics, and ALB% correlated to UPC (r=0.35, R2=0.12, p