C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
	public static void Main()
	{
		//obtain a list
		IEnumerable<Pet> pets = CreateListOfPets();	
		foreach (var dog in GetDogs(pets).Take(2))
		{
			Console.WriteLine("retrieved: " + dog.Name + " the " + dog.Animal);
		}
	}
	

	public static IEnumerable<Pet> GetDogs(IEnumerable<Pet> pets){
		List<Pet> dogs = new List<Pet>();
		foreach (var pet in pets)
		{
			Console.WriteLine("Processing: " + pet.Animal);
			if(pet.Animal=="Dog")
			{
				dogs.Add(pet);
			}
		}
		return dogs;
	}
	
public static IEnumerable<Pet> CreateListOfPets(){
	return new List<Pet>{
		new Pet{Animal="Dog",Colour="Black", Name="Rocky"},
		new Pet{Animal="Cat",Colour="Black", Name="Betty"},
		new Pet{Animal="Dog",Colour="White", Name="Fluffy"},
		new Pet{Animal="Elephant",Colour="Grey", Name="Nellie"},
		new Pet{Animal="Dog",Colour="Brown", Name="Lassie"},
		new Pet{Animal="Cat",Colour="Brown", Name="Mr Jinx"},
		new Pet{Animal="Mouse",Colour="Brown", Name="Micky"},
		new Pet{Animal="Cat",Colour="Black", Name="Tom"},
		new Pet{Animal="Leonardo",Colour="Green", Name="Turtle"},
		new Pet{Animal="Lizard",Colour="Brown", Name="Yoda"}		
	};
	}	
}


public class Pet{
	public string Animal {get;set;}
	public string Colour {get;set;}
	public string Name {get;set;}
}

 
using System;
using System.Collections.Generic;
using System.Linq;
​
public class Program
{
    public static void Main()
    {
        //obtain a list
        IEnumerable<Pet> pets = CreateListOfPets(); 
        foreach (var dog in GetDogs(pets).Take(2))
        {
            Console.WriteLine("retrieved: " + dog.Name + " the " + dog.Animal);
        }
    }
    
​
    public static IEnumerable<Pet> GetDogs(IEnumerable<Pet> pets){
        List<Pet> dogs = new List<Pet>();
        foreach (var pet in pets)
        {
            Console.WriteLine("Processing: " + pet.Animal);
            if(pet.Animal=="Dog")
            {