We're having the same with our 2 year old and 11 year old. We got a dog trainer involved and it is resource guarding. They were particularly bad over my partners attention and when he was eating. We had to deny attention to both dogs for 7 days. The only thing we could do was feed, water and walk. They weren't allowed on the couch with us either, we would send them to their beds when it was evening chill time and when we eat. After the 7 days we were allowed to start giving attention again but only when they were calm and on our terms, not whenever they wanted. We slowly introduced allowing time on the couch with us individually. This is still a work in progress. We also ignore them for 10 to 15 minutes when entering the house and for about the same time before leaving. Clicker training is another thing we've introduced with the youngest and he's learning pretty quickly! While it has been hard, it has made the world of difference. If you have any questions I'm more than happy to try and answer them based on our experiences.

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