Shabby long beards are like the beards of beasts as per Hafidh Gondalwi rahimahullah.

Shaykh Abdul Hameed Hazarawi said, the great Hafidh, Hafidh Muhammad Gondalwi rahimahullah also used to cut beard after one fist. Someone asked him, do you cut your beard? He replied, do we remain like a Wahshi (a beast).

Yuk Must darhi ki Shari Hasiyat page 157