पशुमण्डूकमार्जारश्वसर्पनकुलाखुभिः । अन्तरागमने विद्यादनध्यायमहर्निशम् ॥ १२६ ॥
Know that (the Veda-study must be) interrupted for a day and a night, when cattle, a frog, a cat, a dog, a snake, an ichneumon, or a rat pass between (the teacher and his pupil).
english translation