yak

/jak/

Cases

SingularPluralWhen to use it
nominativeyakthe yakyaklathe yaksthe plain dictionary form — the doer of the sentence
genitiveyaknıthe yak'syaklanıthe yaks'the owner — whose it is
accusativeyaknıthe yak (as the object)yaklanıthe yaks (as the object)a specific, known object — whom or what
dativeyakhato the yakyaklağato the yaksdirection or recipient — to where, to whom
locativeyakdaat / in the yakyakladaat / in the yakswhere it is; also having — mende bar, "I have it"
ablativeyakdanfrom the yakyakladanfrom the yakswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myyagımmy yakyaklarımmy yaks
youryagıngyour yakyaklarıngyour yaks
his / heryagıhis / her yakyaklarıhis / her yaks
ouryagıbızour yakyaklarıbızour yaks
you all'syagığızyou all's yakyaklarığızyou all's yaks
theiryaklarıtheir yakyaklarıtheir yaks

The overlap in the last rows is real, not a mistake: yakları can mean "his / her yaks", "their yak", or "their yaks" — context decides.