Around 4 months of age, your Lab puppy will begin replacing the milk teeth with adult teeth. At 6 to 7 months, the full set of 42 permanent teeth will be in.
(plural strike rates) ( 1 baseball) the number of runs of a batter divided by the number of balls faced. ( 2 cricket) the number of runs scored by a batsman per 100 balls faced; the number of balls bowled by a bowler divided by the number of wickets taken.  Link/Cite.
The strike zone is a three-dimensional area with top of the zone halfway between the batter's shoulders and top of his uniform pants, the bottom of the zone is the hollow of his knee, the right and left boundaries are the edges of home plate. When a batter records three strikes, he has earned an out.