This research was performed to describe the characteristics of the progression of naturally occurring chronic kidney disease (CKD) in dogs, together with the management of identified risk factors, following the International Renal Interest Society recommendations. Dogs diagnosed and staged with CKD, and with a longitudinal follow-up from the moment of diagnosis of up to a maximum of 730 days, were included. A total of 545 dogs that presented risk factors for the development of CKD were analyzed, out of which 36 met the inclusion criteria. Advanced age was identified in 80.6% of cases. Initiation risk factors were represented by inflammatory/infectious diseases, history of anesthetic-surgical procedures, heart disease, neoplasms, endocrinopathies, and exposure to nephrotoxic drugs. During the follow-up period, progression of CKD was identified in 47.2% of the cases, being more salient in advanced stages. Serum symmetric dimethyl arginine (SDMA) was the only glomerular filtration rate (GFR) marker which displayed differences among studied times during early stages of CKD, associated with the disease progression and decline of renal function. A significant difference between the survival curves in early and advanced CKD stages was observed. The factors related to decreased survival were hyperphosphatemia, anemia, and low body condition score (BCS). No differences were found between the presence of arterial hypertension and renal proteinuria and decreased survival. Furthermore, CKD diagnosis based on the persistent finding of abnormalities in early disease markers, such as serum symmetric dimethyl arginine increase and/or renal proteinuria, and timely therapeutic management of risk factors, allowed for CKD stabilization, reducing progression to advanced stages, and favoring higher survival rates.

In animals with chronic pathologies, the detection of proteinuria via the proteinuria: creatininuria ratio (UPC) and urinary protein electrophoresis allows for the early diagnosis of chronic kidney disease (CKD). The objective of this work was to identify and determine the magnitude of proteinuria and its electrophoretic pattern characterization in dogs with chronic diseases pathophysiologically related to proteinuria. With the studied patients, five groups were formed. The control group (CG) contained non-proteinuric cases. The cases with proteinuria were classified into four groups according to the concurrent disease: chronic inflammatory diseases (IG), neoplasms (NG), heart diseases (HG), and endocrine diseases (EG). For the statistical analysis, descriptive statistics and non-parametric tests were used. Data from 264 dogs were obtained; in the disease groups, proteinuria was observed in more than 30% as the only finding of kidney disease, evidencing a greater risk factor for proteinuria in the HG group (OR 4.047, CI 1.894–8.644, p < 0.0001). In the HG, NG, and EG groups, a higher frequency of glomerular pattern (GEP) related to glomerular hypertension was observed; in the IG, a higher frequency of mixed pattern (MEP) was observed. These findings are secondary to the hyperfiltration process that affects the glomerulus and the renal tubule.

The objective of this work was to determine the repercussion of the metabolic changes that occur in induced subclinical pregnancy toxemia in single-or twin-bearing ewes on the duration of gestation, type and length of lambing, and placental expulsion time. Fifty-one adult Corriedale ewes with a known gestation date and fed in the wild were randomly divided at day 145 of gestation into four groups. Group A included single-bearing ewes, and C twin-bearing ewes, all of which were fed ad libitum. Group B was composed of single-bearing ewes, and D of twin-bearing ewes, all subjected to a 75% feed restriction until glycemic values were compatible with subclinical pregnancy toxemia. Metabolic parameters were determined in all ewes from day 145 of gestation to 72 h postpartum. Likewise, the duration of gestation, type of lambing (eutocic/dystocic), labor length, and placental expulsion time were recorded. Glycemia and β-hydroxybutyrate values compatible with subclinical pregnancy toxemia were achieved after 48 h of feed restriction, being 30.67±2.37 mg/dL and 1.87±0.12 mmol/L in single-bearing ewes and 28.40±3.39 mg/dL and 2.21±0.42 mmol/L in twin-bearing ewes, respectively. It is concluded that subclinical pregnancy toxemia induced by feed restriction at the end of gestation, frequent situation that occurs in flock management, produces mild metabolic changes, which return to normal values after the delivery. These metabolic changes registered before lambing do not modify the gestation length, do not increase the percentage of dystocical deliveries, nor influence labor length or placental expulsion time.

Objetivo. Determinar la correlación de los biomarcadores de funcionamiento renal en la primera evaluación en perros con diferentes factores de riesgo identificados para desarrollar enfermedad renal crónica (ERC). Materiales y métodos. Se realizó un estudio descriptivo, prospectivo de casos y controles de 388 animales, divididos en cinco grupos: grupo control (GC), y cuatro grupos de perros potencialmente enfermos renales (pERC). Se analizaron historia clínica, examen físico, condición corporal (CC), hemograma, perfil bioquímico con dimetilaginina simétrica (SDMA), urianálisis, ratio proteinuria/creatininuria (UPC) y medición de presión arterial sistémica. Se utilizó estadística no paramétrica y los datos fueron expresados en medianas y percentiles; para la CC se utilizó Xi2. Para los biomarcadores se realizó correlación de Spearman. Resultados. Para SDMA y la creatinina sérica (CrS) se observó una correlación moderada para pERC (r = 0.69, p ˂ 0.001). Se observaron diferencias significativas en las variables edad (p = 0.002), y CC (p ˂ 0.001) entre el GC y los pERC. Los animales azotemia leve (CrS 125-250 mmol/L) y/o con un valor de SDMA de 18-35 mg/dL, con o sin proteinuria tuvieron una mayor probabilidad de presentar un incremento de SDMA cuando se presentó una CC por debajo de 5/9 (OR = 3.55, p = 0.005). Conclusiones. El SDMA es un biomarcador complementario útil en etapas preazotémicas y en estadios avanzados donde existen caquexia y sarcopenia. Los biomarcadores deben evaluarse en conjunto para tener perspectiva completa de la función renal en los animales con factores de riesgo para desarrollar ERC.