You have to keep talking to Tartan for awhile.(I talked to him one day all day long on the game) Then, he will eventually say, do you want to hybrid? Then, you can mix and hybrid whenever you want! Hope I helped!
PS-If you have problems with your pets,go to my "I know EVERYTHING about your cat and dog, if you need help, I am on everyday!" forum. New-I now know how to get all the pets in the game.
Thanx,
girly91632
I luv helping peoplez.....so if ya need help on any animals on Harvest Moon A Wonderful Life, just go to my thread. I can help you with any problem. I am an expert on the animals.