dog.dart

{
    "id": 1,
    "breed": "Rottweiler",
    "name": "Mackie",
    "age": 8
}

class Dog {
  int id;
  String breed;
  String name;
  int age;

  Dog({this.id, this.breed, this.name, this.age});

  Dog.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    breed = json['breed'];
    name = json['name'];
    age = json['age'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['id'] = this.id;
    data['breed'] = this.breed;
    data['name'] = this.name;
    data['age'] = this.age;
    return data;
  }
}