### Clue: Flash on you, blue collars for dog (7)
### Answer: SAMOYED 
 ### Explanation: Definition: dog
 [ MO(short for "moment";a brief time;a flash, as in "it was over in a flash") **placed above**(on, in a down clue) YE(archaic or dialect form of "you", as in "gather ye rosebuds, while ye may") ] **contained in**(… collars) SAD(down;blue).