just wondering whether it is abnormal for a border collie bitch not to have been in season at the age of 16 months (as far as we are aware)
if it is not abnormal, when can i expect her to come into season?

most bitches come in to season before they are 18 months old, i dont know much about your breed but i would of thought that if she has not had a season by 18 months old then i would get her checked by your vet