Our expert says:
This is a very difficult thing to solve. If they have done it once, they will do it again. Short of using an electric shock collar (which is a bit cruel), there is not much you could do. If left unattended, he might turn on the cats again. They have a natural hunting instinct and terriers were bred for this.
I would suggest you get an accredited animal behaivourist to do a complete assessment on your dogs and give you detailed advise. Goto www.animal-behaviour.org.za and find someone in your area that could assist.
You could do some positive reinforcement training and hope it helps you.
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