as for Volka my CAO who was accused of being aggressive in other threads and was criticized by many...well he is 6 and half months old 110 lbs and over 28 inches at the withers..aggressive! today i took him to the park on empty stomach we stayed late and he played with other dogs , he was starving..as we are going towards the car he pulled towards a little 1 year old girl with her mom who seemed comfortable with the dog. the girl was in a baby rolling chair (whatever it is called)holding a cracker. Volka came close sniffing her face her cracker without touching it ( he was licking his lips so hungry) then he went down and sniffed her feet still did not touch her cracker. the girl hit him on the nose and talked to him baby talk and still he was so gentle. after few minutes the mom gave him a cracker he just gulped it instantly! now that's a killer dog!
My dog Chloe can be taken into a vet clinic, have blood drawn, have an IV catheter placed, be given injections and basically have everything done to her under the sun and she is perfect. No problems. She holds still, shows no aggression, and besides some anxiety related behaviors is 100% a model patient.
This is also the dog that has bitten members of my family numerous times, tries to attack male visitors, and cannot be trusted around any guests due to her habit of eliciting attention and then biting.
Just because a dog doesn't show aggression in a certain context doesn't mean it isn't aggressive, nor does it mean it is a stable dog. I'm not saying your dog IS aggressive or IS unstable...just saying that aggression isn't generalized.