We rescued two dogs from the ISPCA (Irish Society of Protection to Cruelty to Animals) over a year ago.
One is a Terrier Cross (Jamie) and one a Spaniel / Labradour Cross (Forest). Initially they got on well although Jamie was the more dominent and anxious. Forest was more nervous and submissive.
Jamie then started attacking Forest for no aparent reason (although I realise there must have been one - we just could not figure out what). Forest always submitted by laying down and rolling over. But Jamie would not leave off even once Forest submitted. Jamies jaws just locked tight and we had to intervene by pulling him off.
We tried using a technique where you stop the aggressive dog by holding them down until they submit to you and then bring the two dogs together. Although this worked at the time, Jamie would attack again after a short while. We repeated the process a number of times but this didn't stop the attacks.
Eventually Forest started retaliating. It came to a head when Forest was badly bitten on the leg needing stitches.
They now go into an instant Red Zone as soon as they see each other and we are currently keeping them apart. I know that this is not good for either dog as neither are part of the pack. Instead, one or the other is with us at any one time.
Both dogs are now showing agression towards other dogs when we take them out for their walks.
IS there anyone out there who can suggest ways that we can correct this behaviour?