Animal Wild Relatives (kotieläinten luonnonvaraiset sukulaiset). There are many wild close relatives of domestic animals in the world. Here are some and you can search for more online yourself.
Search words: wild and the name of the pet. It works best if you search in English.
MidnightKobra123: Przewalski Wild Horse, 5:47 min.
yosemitenationalpark: Bighorn Sheep - Yosemite Nature Notes - Episode 27, 8:58 min.
L. Bruce Kekule: Banteng Thailand's Wild Cattle, 4:29 min.
Imperial Cemani: Junglefowls: The Living Ancestors of the Modern Chicken 12:43
Horse
Euroasialainen villihevonen eli tarpaani (Wikipedia)
Przewalski (Wikipedia)
Polish Konik (Wikipedia)
Cattle
Alkuhärkä (wikipedia)
Info about wild cattle (Asian Wild Cattle Specialist Group)
Gauri (Wikipedia)
Bantengi (Wikipedia)
Yak (Wikipedia)
Intian endangeroude cattle (India Environmental Portal)
Mithun, India
Sheep
European mouflon (Wikipedia)
Bighorn sheep (Wikipedia)
Urial sheep (Wikipedia)
Feral or animals that have gone wild or have a recent wild history:
Norweigan Villsau sheep (Wikipedia, half domesticated)
Goat
Wild goats (Wikipedia)
Walia ibex (Wikipedia)
Isaäc J. Nijman, Benjamin D. Rosen, Zhuqing Zheng, Yu Jiang, Tristan Cumer, Kevin G. Daly, Valentin A. Bâlteanu, Beate Berger, Thor Blichfeldt, Geert Boink, Sean Carolan, Vlatka Cubric-Curik, Juha Kantanen, Amparo Martínez, Raffaele Mazza, Negar Khayatzadeh, Namshin Kim, Nadjet-Amina Ouchene-Khelifi, Filipe Pereira, Anne da Silva, Mojca Simčič, Johann Sölkner, Alison Sutherland, Johannes Tigchelaar, Econogene Consortium, Paolo Ajmone-Marsan, Daniel G. Bradley, Licia Colli, François Pompanon, Johannes A. Lenstra (2020): Phylogeny and distribution of Y-chromosomal haplotypes in domestic, ancient and wild goats. bioRxiv. doi: https://doi.org/10.1101/2020.02.17.952051
Cat
European wildcat (Wikipedia)
Pig
Villisika (Wikipedia)
Hen
Red jungelfowl (Wikipedia) and grey junglefowl (Wikipedia)
Feral chicken (Wikipedia)
Dogs
African wild dog (Wikipedia)
New Guinea Highland Wild Dog (järjestö) ja New Guinea sining dog (wikipedia)
Fish
The genetic diversity of fish is under investigation for the time being. The swedes are making research on their genetics and develop methods for their DNA research.
Other
Muskox (Wikipedia)
Reindeer (Wikipedia)
Finnish forest reindeer (Wikipedia)
Mental Floss: 14 of your Dog's wild relatives (blog)