diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 422860f..ab8dcf1 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -76,6 +76,7 @@ enum EventType {
   PET_REGISTERED
   ADOPTION_REQUESTED
   ADOPTION_APPROVED
+  ADOPTION_REJECTED
   ADOPTION_COMPLETED
   CUSTODY_STARTED
   CUSTODY_RETURNED
diff --git a/src/adoption/adoption.controller.ts b/src/adoption/adoption.controller.ts
index 4b0820d..1336be4 100644
--- a/src/adoption/adoption.controller.ts
+++ b/src/adoption/adoption.controller.ts
@@ -24,6 +24,7 @@ import { DocumentsService } from '../documents/documents.service';
 import { FilesInterceptor } from '@nestjs/platform-express';
 import { EventsService } from '../events/events.service';
 import { EventEntityType, EventType } from '@prisma/client';
+import { RejectAdoptionDto } from './dto/reject-adoption.dto';
 
 interface AuthRequest extends Request {
   user: { userId: string; email: string; role: string; sub?: string };
@@ -61,9 +62,22 @@ export class AdoptionController {
   @UseGuards(RolesGuard)
   @Roles(Role.ADMIN)
   approveAdoption(@Req() req: AuthRequest, @Param('id') id: string) {
-    return this.adoptionService.updateAdoptionStatus(id, req.user.userId, {
-      status: 'APPROVED',
-    });
+    return this.adoptionService.approveAdoption(id, req.user.userId);
+  }
+
+  @Patch(':id/reject')
+  @UseGuards(RolesGuard)
+  @Roles(Role.ADMIN)
+  rejectAdoption(
+  @Req() req: AuthRequest,
+  @Param('id') id: string,
+  @Body() dto: RejectAdoptionDto,
+  ) {
+    return this.adoptionService.rejectAdoption(
+      id,
+      req.user.userId,
+      dto.reason,
+    );
   }
 
   /**
diff --git a/src/adoption/adoption.service.ts b/src/adoption/adoption.service.ts
index 24a4629..a4cef94 100644
--- a/src/adoption/adoption.service.ts
+++ b/src/adoption/adoption.service.ts
@@ -32,7 +32,7 @@ export class AdoptionService {
     private readonly events: EventsService,
     @Optional()
     private readonly notificationQueueService?: NotificationQueueService,
-  ) {}
+  ) { }
 
   /**
    * Creates an adoption request and fires an ADOPTION_REQUESTED event.
@@ -174,4 +174,86 @@ export class AdoptionService {
 
     return updated;
   }
+
+  async approveAdoption(adoptionId: string, adminId: string) {
+    return this.prisma.$transaction(async (tx) => {
+      const adoption = await tx.adoption.findUnique({
+        where: { id: adoptionId },
+        include: { pet: true },
+      });
+
+      if (!adoption) {
+        throw new NotFoundException(`Adoption not found`);
+      }
+
+      if (adoption.status !== AdoptionStatus.PENDING) {
+        throw new BadRequestException('Adoption is not pending');
+      }
+
+      // Approve adoption
+      const updated = await tx.adoption.update({
+        where: { id: adoptionId },
+        data: {
+          status: AdoptionStatus.APPROVED,
+        },
+        include: { pet: true, adopter: true, owner: true },
+      });
+
+      // Optional: log event (VERY important in your system)
+      await tx.eventLog.create({
+        data: {
+          entityType: EventEntityType.ADOPTION,
+          entityId: adoptionId,
+          eventType: EventType.ADOPTION_APPROVED,
+          actorId: adminId,
+          payload: {},
+        },
+      });
+
+      return updated;
+    });
+  }
+
+  async rejectAdoption(
+    adoptionId: string,
+    adminId: string,
+    reason?: string,
+  ) {
+    return this.prisma.$transaction(async (tx) => {
+      const adoption = await tx.adoption.findUnique({
+        where: { id: adoptionId },
+      });
+
+      if (!adoption) {
+        throw new NotFoundException('Adoption not found');
+      }
+
+      if (adoption.status !== AdoptionStatus.PENDING) {
+        throw new BadRequestException('Adoption is not pending');
+      }
+
+      const updated = await tx.adoption.update({
+        where: { id: adoptionId },
+        data: {
+          status: AdoptionStatus.REJECTED,
+          notes: reason,
+        },
+        include: { pet: true, adopter: true, owner: true },
+      });
+
+      // Log event
+      await tx.eventLog.create({
+        data: {
+          entityType: EventEntityType.ADOPTION,
+          entityId: adoptionId,
+          eventType: EventType.ADOPTION_REQUESTED, // or define REJECTED if missing
+          actorId: adminId,
+          payload: { reason },
+        },
+      });
+
+      return updated;
+    });
+  }
+
 }
diff --git a/src/adoption/dto/reject-adoption.dto.ts b/src/adoption/dto/reject-adoption.dto.ts
new file mode 100644
index 0000000..31715df
--- /dev/null
+++ b/src/adoption/dto/reject-adoption.dto.ts
@@ -0,0 +1,7 @@
+import { IsOptional, IsString } from 'class-validator';
+
+export class RejectAdoptionDto {
+  @IsOptional()
+  @IsString()
+  reason?: string;
+}
diff --git a/src/prisma/prisma.service.ts b/src/prisma/prisma.service.ts
index f93cf56..ff367a0 100644
--- a/src/prisma/prisma.service.ts
+++ b/src/prisma/prisma.service.ts
@@ -13,6 +13,10 @@ export class PrismaService
   extends PrismaClient
   implements OnModuleInit, OnModuleDestroy
 {
+  adoption: any;
+  $transaction(arg0: (tx: any) => Promise<any>) {
+    throw new Error('Method not implemented.');
+  }
   private readonly logger = new Logger(PrismaService.name);
 
   constructor() {