I saw a study a few years back that indicated that dogs can remember thier siblings for up to 4 years of being apart. I cant find the video but this was tested by getting groups of siblings back together after varying timeframes. The ones who had been apart for over 4 years didn't seem to recognise each other anymore.
Not sure about parent/child relationships though and also not sure if this would count for seperate litters.
TokerSmurf t1_jamigmc wrote
Reply to Nature-do animals know their offspring/parents? by StubbornAries
I saw a study a few years back that indicated that dogs can remember thier siblings for up to 4 years of being apart. I cant find the video but this was tested by getting groups of siblings back together after varying timeframes. The ones who had been apart for over 4 years didn't seem to recognise each other anymore.
Not sure about parent/child relationships though and also not sure if this would count for seperate litters.