Synonyms for Mutt:

n.

foxhound, guard dog, bird dog, hound, gun dog, lapdog, attack dog, guide dog. dog (noun)
hound.
mutt (noun)
cur, mongrel.
scruffy dog (noun)
mongrel.

Other synonyms:

foxhound, guard dog, bird dog, hound, gun dog, lapdog, attack dog, guide dog. Other relevant words:
cur, hound, mongrel, bird dog, lapdog, foxhound.