On the game petz dogz pack why wont my pets breed?

ok heres what you do to get em to 1. make sure you have a boy and girl 2. make sure there both grown ups (make them have all 3 hearts by petting them alot) 3.make sure they both spend alot of time together and play in between give em water and food breaks. 4.just leave them alone and let them have time alone to play and get happy and then 5. hearts will appear it had a pup!