at

/at/

Cases

SingularPluralWhen to use it
nominativeatthe horseatlathe horsesthe plain dictionary form — the doer of the sentence
genitiveatnıthe horse'satlanıthe horses'the owner — whose it is
accusativeatnıthe horse (as the object)atlanıthe horses (as the object)a specific, known object — whom or what
dativeathato the horseatlağato the horsesdirection or recipient — to where, to whom
locativeatdaat / in the horseatladaat / in the horseswhere it is; also having — mende bar, "I have it"
ablativeatdanfrom the horseatladanfrom the horseswhere 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
myatımmy horseatlarımmy horses
youratıngyour horseatlarıngyour horses
his / heratıhis / her horseatlarıhis / her horses
ouratıbızour horseatlarıbızour horses
you all'satığızyou all's horseatlarığızyou all's horses
theiratlarıtheir horseatlarıtheir horses

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