Collar Code Girls:

Pink- yellow
Fuschia-yellow
Green-black
Orange-black
white-black
2 weeks old
    Collar Code Boys:
                                            
Blue-black               
None-Yellow
      
3 weeks old
Blue/Male                                Green/female                        Orange/female                        White/female
Fuschia/female                        Pink/female                                        Yellow male
4 weeks old