I've started looking after my sister's dog one day a week whilst she is back at work. The only problem is, he is very possessive over things, and resource guards. Once he has something (could be a toy or food) he will not let you anywhere near him. He growls, barks and bears his teeth. I have young DC and am finding it hard to manage this. I have a dog myself who has never shown any resource guarding issues so i have no idea what to do. My sister says just leave him to it until he's finished with whatever it is he has but he seems to be getting worse. Last week he pinched one of DDs teddies and wouldn't let go until he'd chewed it to bits, my DD was really upset. I tried to swap for high value treat, but it didn't work.
Advice please!