Wendi doubled her number of chickens from 4 to 4*2=<<4*2=8>>8 chickens.
After a dog ate one of the chickens, 8-1=<<8-1=7>>7 chickens remained.
4 less than 10 is 10-4=<<10-4=6>>6.
Therefore, Wendi added another 4 less than ten chickens for a total of 7+6=13 chickens.
#### 13