Different languages write animal sounds different ways.

Cat

The unique sound a cat makes is rendered onomatopoeically as "meow" or similar variants ("miaow", "miau" etc.) in most European languages as well as Mandarin Chinese. Japanese has it as "nyaau" or "nyan"; Korean as "yaong" or "nyaong". In Arabic the sound is transcribed as "mowa'a" or "naw". Other variants exist throughout the world. The sound of an increasingly annoyed cat is transcribed in James Joyce's Ulysses as "mkgnao", "mrkgnao" and "mrkrgnao".

Dog

Afrikaans: woef

Albanian: ham ham / hum hum

Arabic (Algeria): haw haw

Bengali: ghaue-ghaue

Catalan: bup, bup

Chinese (Mandarin): wang wang

Croatian: vau-vau

Danish: Dutch: woef

English: bow-wow, arf, woof, ruff ruff

English (Old English): Hund byrcð.

Esperanto: boj

Estonian: auh

Finnish: hau hau /vuh vuh

French: ouah ouah

German: wau wau, wuff wuff

Greek: gav

Hebrew: haw haw (/hav hav)

Hindi: bho:-bho:

Hungarian: vau-vau

Icelandic: voff

Indonesian: gonggong

Italian: bau bau

Japanese: wanwan, kyankyan

Korean: mung-mung (/wang-wang)

Norwegian: voff / vov-vov

Polish: hau hau

Portuguese (Portugal): au au au (nasal diphthong)

Portuguese (Brazil): au-au

Russian: gav-gav

Slovene: hov-hov

Spanish (Spain, Argentina): guau guau

Swedish: vov vov

Thai: hoang hoang (with falling tone)

Turkish: hav, hav

Ukrainian: haf-haf

Vietnamese: wau wau

References

Animal Sounds: Dog