diff --git a/README.md b/README.md
index 1bba241..df8d8d8 100644
--- a/README.md
+++ b/README.md
@@ -30,14 +30,17 @@ import DogAPI
 let dogAPI = DogAPI()
 ```
 
-### Fetch All Breeds
+### Fetch Breeds & Sub-Breeds
 ```swift
 do {
-    // fetch list of all breeds and sub-breeds
+    // fetch list of all breeds
     let breeds = try await dogAPI.fetchAllBreeds()
     print(breeds)
+    // fetch list of all sub-breeds of a breed
+    let subBreeds = try await dogAPI.fetchAllSubBreeds(breed: "retriever")
+    print(subBreeds)
 } catch {
-    print("Error fetching breeds: \(error)")
+    print("Error fetching breeds & sub-breeds: \(error)")
 }
 ```
 
diff --git a/Sources/DogAPI/DogAPI.swift b/Sources/DogAPI/DogAPI.swift
index de2a853..fad32be 100644
--- a/Sources/DogAPI/DogAPI.swift
+++ b/Sources/DogAPI/DogAPI.swift
@@ -20,6 +20,13 @@ public struct DogAPI {
         try await client.fetch(.allBreeds)
     }
 
+    /// Fetch list of all sub-breeds for a breed
+    /// - Parameter breed: breed to fetch sub-breeds for
+    /// - Returns: list of sub-breeds for the breed
+    public func fetchAllSubBreeds(breed: DogBreed) async throws -> [DogSubBreed] {
+        try await client.fetch(.allSubBreeds(breed))
+    }
+
     /// Fetch single random image from all dogs collection
     /// - Returns: URL of random dog image
     public func fetchRandomImage() async throws -> DogURL {
diff --git a/Sources/DogAPI/DogAPIEndpoint.swift b/Sources/DogAPI/DogAPIEndpoint.swift
index 8043d4c..1fd4738 100644
--- a/Sources/DogAPI/DogAPIEndpoint.swift
+++ b/Sources/DogAPI/DogAPIEndpoint.swift
@@ -24,7 +24,7 @@ enum DogAPIEndpoint {
         case .allBreeds:
             "breeds/list/all"
         case .allSubBreeds(let breed):
-            "breeds/\(breed)/list"
+            "breed/\(breed)/list"
         case .randomImage:
             "breeds/image/random"
         case .randomImages(let count):
diff --git a/Tests/DogAPITests/DogAPITests.swift b/Tests/DogAPITests/DogAPITests.swift
index 69efb2f..907a4b5 100644
--- a/Tests/DogAPITests/DogAPITests.swift
+++ b/Tests/DogAPITests/DogAPITests.swift
@@ -25,6 +25,18 @@ final class DogAPITests: XCTestCase {
         XCTAssertEqual(breeds, ["affenpinscher":[],"african":[],"airedale":[],"akita":[],"appenzeller":[],"australian":["kelpie","shepherd"]])
     }
 
+    func test_fetchAllSubBreeds_success_allSubBreeds() async throws {
+        // given the all sub-breeds request will succeed
+        let url = URL(string: "https://dog.ceo/api/breed/hound/list")!
+        let expectedResponse = HTTPURLResponse(url: url, statusCode: 200, httpVersion: nil, headerFields: nil)
+        let expectedData = #"{"message":["afghan","basset","blood","english","ibizan","plott","walker"],"status":"success"}"#.data(using: .utf8)!
+        MockURLProtocol.expect(.init(data: expectedData, response: expectedResponse), for: url)
+        // when user requests all sub-breeds for a breed
+        let subBreeds = try await api.fetchAllSubBreeds(breed: "hound")
+        // then all sub-breeds are returned
+        XCTAssertEqual(subBreeds, ["afghan","basset","blood","english","ibizan","plott","walker"])
+    }
+
     func test_fetchRandomImage_success_randomImage() async throws {
         // given random image request will succeed
         let url = URL(string: "https://dog.ceo/api/breeds/image/random")!