Today was one of the worst days I ever had and I guess it was my fault. Twelve years ago we bought a Jack Russell Terrier. She has been a joy to own. Extremely well behaved and very calm. When we bought her I mentioned to the breeder that I might want to get a second one. He said what ever you do don't get another female, that eventually one would kill the other. When it came time to get another dog we fell in love with the cutest most affectionate little puppy imaginable. We thought that since our dogs are very well behaved and spayed that it wouldn't be a problem. Daisy accepted Jasmine right away and mothered her constantly. She wouldn't eat until Jasmine was fed, they played tag, tug of war and all the the things that dogs do that brings joy to your heart. When friends would come over they would be amazed at how well behaved the dogs were and would ask "are you sure that these are JRTs. Everyone would like Daisy, but would fall in love with the extremely loving and affectionate Jasmine. Our fairy tale dog experience lasted for 7 years. Suddenly, we were having dog fights. Jasmine and Daisy would be playing, or lying quietly next to us and from out of the blue Jasmine would attack Daisy. Oft times these fights would occur in the middle of our bed at 2 or 3 in the morning. Trying to separa te 2 viciously fighting dogs is almost impossible. Several times the aftermath required stitches for them and bandaids for me. We tried everything to prevent these episodes. We tried to make sure that each dog got equal attention, we removed any toys that they might fight over, eliminated anything that might cause jealousy. Each time we would have one of these events it would become worse and each time within minutes after you wouldn't think that they were capable of fighting. Daisy would be her normal quiet reserved "old lady" and Jasmine would be back to her super affectionate self. For three years we have lived with baited breath dreading the next incident. Unfortunately, Jasmine seemed to initiate these attacks with ever increasing regularity. Tonight Daisy walked into the family room and Jasmine launched of the couch and the fight ensued. The last one was only about 3 weeks ago. Now it looks as if Daisy, who's now 12 years old, is going to be blind in one eye from tonight's fight. So after much heart rendering and tear stained discussion we decided that we must put Jasmine down. She had become much to unpredictable. We didn't trust her around little kids anymore and often she would growl at us or even snap, and as always she would immediately return to her super affection self that would melt your heart. We discussed taking her tomorrow to have the Vet put her down but decided that it would be better if I did it now rather than having her begging for attention and loving us all night and us unable to sleep because of her decided fate. I can only say is that when reputable breeder give you advise you should take it. We loved Jasmine immensely for 10 years but the heart ache we are feeling tonight could have be avoided. If we had bought a male we wouldn't have had this situation and Jasmine would have been bought by someone else and she would still be alive. Please don't be as I was and think that you can go against experienced advise.