Jack Russell aggression problem

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Barked: Thu Nov 10, '11 8:23am PST 
i have 4 jack russells that seem to be getting more aggressive towards each other. There are 3 females, 9 yr old, 5 yr old, 1 yr old and 1 male1 yr old. The only one at is not aggressive to the others is the 1 yr old female. The 9 and 5 year olds are fighting alot more.

How do I correct this before they injure each other badly?