Add Petfinder (#2511)

README.md

@@ -119,6 +119,7 @@ API | Description | Auth | HTTPS | CORS |
 | [HTTPCat](https://http.cat/) | Cat for every HTTP Status | No | Yes | Yes |
 | [IUCN](http://apiv3.iucnredlist.org/api/v3/docs) | IUCN Red List of Threatened Species | `apiKey` | No | No |
 | [Movebank](https://github.com/movebank/movebank-api-doc) | Movement and Migration data of animals | No | Yes | Yes |
+| [Petfinder](https://www.petfinder.com/developers/) | Petfinder is dedicated to helping pets find homes, another resource to get pets adopted | `apiKey` | Yes | Yes |
 | [PlaceBear](https://placebear.com/) | Placeholder bear pictures | No | Yes | Yes |
 | [PlaceDog](https://place.dog) | Placeholder Dog pictures | No | Yes | Yes |
 | [RandomCat](https://aws.random.cat/meow) | Random pictures of cats | No | Yes | Yes |
@@ -129,6 +130,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Shibe.Online](http://shibe.online/) | Random pictures of Shiba Inu, cats or birds | No | Yes | Yes |
 | [The Dog](https://thedogapi.com/) | A public service all about Dogs, free to use when making your fancy new App, Website or Service | `apiKey` | Yes | No |
 
+
 **[⬆ Back to Index](#index)**
 ### Anime
 API | Description | Auth | HTTPS | CORS |