The most common and most likely answer to this crossword clue is the 6 letter word BEAGLE
B
E
A
G
L
E
More clues leading to the result BEAGLE
- Hunting dog heading for big, big bird
- Dog beginning to burrow great hole on course
- British bird of prey on which Darwin worked
- Black bird and dog
- Sue the French about a dog
- Head to backwoods with bird dog
- British bird – a hunting type of creature
- Live long, occupying time with dog
- Dog or blackbird?
- Hound bald-headed type after bit of banter
Buddy explains!

The straight part
We know that "A dog" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a dog = beagle.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BEAGLE mean?
BEAGLE noun- A small short-legged smooth-coated scenthound, often tricolored and sometimes used for hunting hares. Its friendly disposition makes it suitable as a family pet.
- A person who snoops on others; a detective.
- A bailiff.
- A small kind of shark.
- To hunt with beagles.
- To search.