diff --git a/src/presentation/middlewares/auth.middleware.ts b/src/presentation/middlewares/auth.middleware.ts
index 4f193f6..e20eeaf 100644
--- a/src/presentation/middlewares/auth.middleware.ts
+++ b/src/presentation/middlewares/auth.middleware.ts
@@ -28,12 +28,12 @@ export class AuthMiddleware {
 
     // Check if refresh token and access token are present
     if (!refreshToken && !accessToken)
-      throw new UnauthenticatedError('Please first login');
+      throw new UnauthenticatedError('Por favor loguea con tu cuenta');
 
     if (accessToken) {
       // Validate access token
       const payload = this.jwt.validateToken(accessToken);
-      if (!payload) throw new UnauthorizedError('Invalid token validation');
+      if (!payload) throw new UnauthorizedError('Token JWT inválido');
       req.user = payload.user;
       const wsToken = this.jwt.generateToken({ user: payload.user }, '1d');
       req.user.wsToken = wsToken;
@@ -42,7 +42,7 @@ export class AuthMiddleware {
 
     // Validate refresh token
     const payload = this.jwt.validateToken(refreshToken);
-    if (!payload) throw new UnauthorizedError('Invalid token validation');
+    if (!payload) throw new UnauthorizedError('Token JWT inválido');
 
     const existingToken = await prisma.token.findUnique({
       where: { userId: payload.user.id, refreshToken: payload.refreshToken },
@@ -50,7 +50,7 @@ export class AuthMiddleware {
 
     // Check if existing token is valid
     if (!existingToken || !existingToken?.isValid)
-      throw new UnauthenticatedError('Authentication Invalid');
+      throw new UnauthenticatedError('No autentificado');
 
     const { user } = payload;
 
@@ -84,7 +84,9 @@ export class AuthMiddleware {
       if (role === 'admin') return next();
 
       if (!roles.includes(role!))
-        throw new UnauthorizedError('Unauthorized to access this resource');
+        throw new UnauthorizedError(
+          'No estás autorizado para acceder a este recurso'
+        );
 
       next();
     };
diff --git a/src/presentation/middlewares/error-handler.middleware.ts b/src/presentation/middlewares/error-handler.middleware.ts
index 6a9c6c6..fce6423 100644
--- a/src/presentation/middlewares/error-handler.middleware.ts
+++ b/src/presentation/middlewares/error-handler.middleware.ts
@@ -33,7 +33,7 @@ export class ErrorHandlerMiddleware {
     // Handle jwt expired errors
     if (err?.name && err?.name === 'TokenExpiredError') {
       statusCode = 401;
-      message = 'JWT token expired';
+      message = 'Sin autentificar';
     }
 
     // Handle CustomAPIError
diff --git a/src/presentation/middlewares/file-upload.middleware.ts b/src/presentation/middlewares/file-upload.middleware.ts
index a618764..7aedb82 100644
--- a/src/presentation/middlewares/file-upload.middleware.ts
+++ b/src/presentation/middlewares/file-upload.middleware.ts
@@ -70,7 +70,7 @@ export class FileUploadMiddleware {
             include: { shelter: { select: { images: true } } },
           });
 
-          if (!user) throw new NotFoundError('User not found');
+          if (!user) throw new NotFoundError('Usuario no encontrado');
 
           name = user.username;
           id = user.id;
@@ -89,7 +89,7 @@ export class FileUploadMiddleware {
               name: true,
             },
           });
-          if (!animal) throw new NotFoundError('Animal not found');
+          if (!animal) throw new NotFoundError('Animal no encontrado');
           name = animal.name;
           id = animal.createdBy;
           resourceId = animal.id;
@@ -97,7 +97,7 @@ export class FileUploadMiddleware {
 
         default:
           throw new BadRequestError(
-            `Invalid resource: ${resource}, valid ones: users, animals`
+            `Recurso invalido: ${resource}, validos: users, animals`
           );
       }
 
diff --git a/src/presentation/middlewares/not-found.middleware.ts b/src/presentation/middlewares/not-found.middleware.ts
index e156a20..8457dc3 100644
--- a/src/presentation/middlewares/not-found.middleware.ts
+++ b/src/presentation/middlewares/not-found.middleware.ts
@@ -9,6 +9,6 @@ export class NotFoundMiddleware {
   static init(req: Request, res: Response) {
     res
       .status(HttpCodes.NOT_FOUND)
-      .json({ message: `Route ${req.url} not found` });
+      .json({ message: `Ruta ${req.url} no encontrada` });
   }
 }
diff --git a/src/presentation/users/service.ts b/src/presentation/users/service.ts
index bec671c..36289e7 100644
--- a/src/presentation/users/service.ts
+++ b/src/presentation/users/service.ts
@@ -212,7 +212,9 @@ export class UserService {
       if (city) {
         filters.cityId = city.id;
       } else {
-        throw new NotFoundError(`City ${shelterFilterDto.city} not found`);
+        throw new NotFoundError(
+          `Ciudad ${shelterFilterDto.city} no encontrada`
+        );
       }
     }
 
@@ -309,7 +311,7 @@ export class UserService {
       },
     });
 
-    if (!user) throw new NotFoundError('User not found');
+    if (!user) throw new NotFoundError('Usuario no encontrado');
 
     const userEntity = UserEntity.fromObject(user);
 
@@ -371,7 +373,7 @@ export class UserService {
   public async getSingleUser(term: string) {
     const user = await this.getUserFromTerm(term);
 
-    if (!user) throw new NotFoundError('User not found');
+    if (!user) throw new NotFoundError('Usuario no encontrado');
 
     const userEntity = UserEntity.fromObject(user);
 
@@ -407,7 +409,7 @@ export class UserService {
       }),
     ]);
 
-    if (!userToDelete) throw new NotFoundError('User not found');
+    if (!userToDelete) throw new NotFoundError('Usuario no encontrado');
 
     CheckPermissions.check(user, userToDelete.id);
 
@@ -465,14 +467,14 @@ export class UserService {
   ) {
     const user = await prisma.user.findUnique({ where: { id: userId } });
 
-    if (!user) throw new NotFoundError('User not found');
+    if (!user) throw new NotFoundError('Usuario no encontrado');
 
     if (user) {
       const isValid = prisma.user.validatePassword({
         password: oldPassword,
         hash: user.password,
       });
-      if (!isValid) throw new BadRequestError('Invalid password');
+      if (!isValid) throw new BadRequestError('Password no valido');
       const hashPassword = prisma.user.hashPassword(newPassword);
       await prisma.user.update({
         where: { id: userId },
@@ -495,7 +497,7 @@ export class UserService {
       where: { email: user.email },
     });
 
-    if (!userFound) throw new NotFoundError('User or shelter not found');
+    if (!userFound) throw new NotFoundError('Usuaro o refugio no encontrados');
 
     CheckPermissions.check(user, userFound.id);
 
@@ -539,7 +541,7 @@ export class UserService {
       where: { email: user.email },
     });
 
-    if (!userToUpdate) throw new NotFoundError('User not found');
+    if (!userToUpdate) throw new NotFoundError('Usuario no encontrado');
 
     CheckPermissions.check(user, userToUpdate.id);
 
@@ -624,7 +626,7 @@ export class UserService {
       },
     });
 
-    if (!userToUpdate) throw new NotFoundError('User not found');
+    if (!userToUpdate) throw new NotFoundError('Usuario no encontrado');
 
     let updateQuery: {
       avatar?: string[];
@@ -633,7 +635,7 @@ export class UserService {
 
     if (userToUpdate.role === 'shelter') {
       if (!userToUpdate.shelter)
-        throw new NotFoundError('Shelter not found for user');
+        throw new NotFoundError('El usuario no es un refugio');
 
       const images = userToUpdate.shelter.images;
       const resultImages = await this.buildImages(images, deleteImages, files);
@@ -852,9 +854,9 @@ export class UserService {
       },
     });
 
-    if (!notification) throw new NotFoundError('Notification not found');
+    if (!notification) throw new NotFoundError('Notificacion no encontrada');
     if (notification.isRead)
-      throw new BadRequestError('Notification is already read');
+      throw new BadRequestError('La notificacion ya ha sido leida');
 
     CheckPermissions.check(user, notification.userId);
 
@@ -878,7 +880,7 @@ export class UserService {
       },
     });
 
-    if (!notification) throw new NotFoundError('Notification not found');
+    if (!notification) throw new NotFoundError('Notificacion no encontrada');
 
     CheckPermissions.check(user, notification.userId);