June, July and August is 13 weeks and 1 day.
If your dog was born on August 5, 2009 he would have been 4 months and 3 weeks (20 weeks) old on December 23, 2009.
Four
52
8 weeks and 6 days.
Weeks from August 30 to December 31 2010 is slightly over 17.
Nearly 22 weeks.
19 weeks and 4 days.
Between August 14 2009 and December 8, 2009 there were 16 weeks and 4 days.
18 weeks
In any given year, there are 15 weeks between the two dates.
There are four weeks in December.
There are 4 weeks and 3 days in December.
There are 4 weeks and 3 days in December.
There are 4 weeks and 2 days in December 2010.
About 40 weeks
There are 56.5 weeks between August 1, 2011 and August 31, 2012.