I MYSELF DONT THINK THERE IS COMPLETE ANSWER EITHER, ITS A CHANCE YOU TAKE, STILL I WOULDNT BREED OFF A YOUNG
TERRIER THOUGH THAT IS UNDER 2 YEARS OLD, SOME GOOD POINTS ON THE TOPIC WOULD LIKE TO READ MORE
YIS CHANCER
What about a terrier just over 2yrs, I can't understand your reasoning as there's so little in setting that age as a limit. Say a dog starts at a year old & you were fortunate enough it was this age at the start of the season so has a steady 1st season, after a summer layoff it turns 2yrs at the beginning of the following season & has only completed one full