Suddenly Attacking my other dog
I have had my jack Russel for 6 months now. We got him when he was 5 months old. I have had a chihuahua/terrier mix for 2 years now. These 2 dogs have been really good buddy's for a long time now. Total over 3 months my jack Russel has probably tried to attack my other dog like 4 times. But in the last 3 days he has attacked him numerously!! One day its was 3 times, yesterday it was 4 times and today so far it has been 11 times. I have made sure to show equal attention and everything. The fight is absolutely over nothing. Toby (jack Russel) will just wake up or walk by, look at Tigg (chihuahua/terrier) and go for his neck. Its very scary. I have disciplined him, and put him in a different room for up to 30 min before to let him know that its not tolerated. He will kill my other dog if I were to let it go. Toby is getting fixed next Monday. I really hope it will fix this but what if it doesn't. I don't want to get rid of him, he has a great personality! But 11 times a day is scary, and if I"m not here to stop it, he will kill my other dog!! Is this normal, or how should I go about it?? Please help me?