The most common and most likely answer to this crossword clue is the 8 letter word ALSATIAN
I've seen this crossword clue in The Guardian
A
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S
A
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I
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N
More clues leading to the result ALSATIAN
- Assailant mauled after releasing second dog
- A sovereign met a man and a dog
- Dog, a large devil I kept inside
- German shepherd posed being embraced by a pin-up
- It could be barking at animals with minute gone
- Dog squatted, one occupying a ground taken short
- German shepherd, a large one wearing fine fabric
- Dog the French sent up – one possessed by the devil
- Dog from Alabama rested near Paisley perhaps
- Sat I held fast by boy, but I might bite
Buddy explains!

The straight part
We know that "I might bite" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i might bite = alsatian.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 ALSATIAN mean?
ALSATIAN noun- A native or inhabitant of Alsace.
- (dated US) A German shepherd dog.
- A rogue or debauchee, like those who haunted Alsatia in London.