The Avestan word sūn-
Word sūn-
Meaning dog
See also Carian: qan ‘dog’
Lydian: kan- ‘dog’
Greek: κύων ‘dog’
Latin: canis ‘dog’
Tocharian B: ku ‘dog’
Armenian: šun ‘dog’
C. Luwian: *zu-wa-ni ‘dog’
Proto-Anatolian: *k̂won ‘dog’
Avestan: spa(n) ‘dog’
Proto-Indo-European: *k̂(u)wōn ‘dog’
Proto-Celtic: *kun ‘dog’

Other words that might be of interest
aspa ‘horse’, gauu- ‘cow, bull’, pasu ‘cattle, livestock’, vəhrka- ‘wolf’, uštra- ‘camel’, būza ‘male goat, goat’