Our expert says:
Dog Behaviour Expert
Hi Yoli, very often as aging takes place the behaviour will change with the 8 year old trying to take over top dog position, plus behaviour does sometimes change in older dogs.
Another reason could be physically related, in that the old man may be sore and is acting out when the younger dog tries to touch him.
If there is a physical component this needs to be sorted out first. i would suggest you take the dogs into your local vet and have them checked out physically first. Then and only then would I call in a professional for help. Aggress of any sort needs to be taken seriously and you need a professional for this. Have a look at www.animal-behaviour.org.za for a behaviourist near you. Good luck, thanks Scotty
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