Hi everyone, I'm looking for some advice. I have Oscar a 6 month old Sprocker, not yet neutered, we go to puppy training and he's fairly good with the basics. Over the last few weeks though his behaviour has changed. Among lesser things he has started guarding items he finds high value and had growled at me several times and has also air snapped at me whilst emitting a yelpy bark. He has also done this to our 5 year old too when she approached for a stroke but he was lying on something that he was guarding without me knowing, I was a couple of feet away. Then yesterday we were at a country park with another family, we'd spent several hours and eaten lunch together so he'd seen all the children and was fine. He was under the picnic table, sat right by my leg and a 7 yr old boy went to stroke him and he growled Oscar bit his fingers! Not hard enough to break the skin thank god but it was awful! He Akzo growled at the child's 2 year old brother I've he was out from under the table. I'm scared now that he could bite any one at any time without any signs and I'm scared for my children of 5 and 8. I don't know what to do. Very upset :