fetu verovero, fetuverovero feufeu

feu,  v.n. to growl, as a dog; snarl, grumble.
— v.n. to snort, breathe short through the nose. [Dav : 2489] (note)
feu,  p.n. feufeu, grogner, gronder; secouer un habit. [Jau :1068]