I thought I would give an update on this situation. Ollie is doing better in some respects because we aren't giving this particular bone and we have followed the advice in this thread and don't follow him for things but rather walk away to the 'treat corner' where he brings them anyway, drops them and receives a small treat. It is making it a smaller deal..however when mistakes are made, for instance if my partner forgets that this might happen and reaches for a toy nearby Ollie to move it so that she can sit down he flares up in the same way. I guess it's a question of not forgetting, but naturally my concern is that WE both know this, but not everyone who comes into contact with him can be expected to..this really limits us and how we can leave Ollie with others.. the unpredictability of his reactions means I don't think we can leave him with anyone who doesn't know him well or children (although everything we have seen indicates he is brilliant with children)
This sudden reaction is happening in other areas too... we don't get much warning. For example if we reach down to pick him up and he's not in the mood (although he's all loose, wiggly bum prior which would seem to indicate he's relaxed and happy)he might growl, bark and then bite all within a second - which is not enough for someone reaching for him to recognise that he is warning. Normally I would know..I would see him tense, side eyes and I would know to leave whatever it is for a second, distract him with something else and come back with a treat to re-attempt something. But on these occasions with the prior wiggle bum and the sudden immediate escalation it's impossible to predict.
I guess I'm just really worried about something like cocker rage. Which I know is meant to be rarer nowadays, and isn't he, at 4.5 months, too young to be showing signs of this? I thought it was something that occurred a little later in dogs.
He occasionally wears a 'clix no bark collar' when he is very vocal and today, when he reacted with very sudden aggression to being picked up, it vibrated on his bark and he backed down as he doesn't like the vibration setting. This is the first time that this particular scenario has arisen and I am thinking he should wear this collar all the time now, just in case? (Just to point out, he is generally (90% of time) fine with being picked up and I don't want to back away from this altogether as there might be times when this is necessary - for eg, when he was confronted by 14 chihuahuas recently)