
Hi magica,
I'm glad that Snoop's health seems to be improving :)
Re the behaviour -
> this dog went into a prey sort of walk towards us- fixated stare, head low
This type of approach by BCs and my own breed for that matter is not abnormal - it is a breed thing, ready to herd, round up and chase etc and can be misconstrued as a prelude to attack. Did you perhaps anticipate that the collie would 'have a go' and in doing so send a signal to Snoop that you were tense/concerned/apprehensive etc? It's easily done and we don't often know that we're doing it :)
IMO if this dog had wanted to scrap it wouldn't have been put off it's mission by you speaking to it. Equally, had Snoop really wanted to do damage to this dog, it would have been injured - not just a yelp :)
It's great that you're trying to keep on top of things etc but maybe on this occasion you've been a little too aware of small things which has caused them to seem more significant than they are.
On top of all of this Snoop will naturally have been on a high having been confined for so long and he was probably bursting with unspent energy and excitement so more reactive than he would be normally had his exercise and outings not been so limited for so long.
This of course is my take on things - you may feel differently and other posters too :)
regards Teri