TypeScript problem with iterating over object properties

type Animal = {
    name: string;
    age: number
}

const animal:Animal={
    name:"dog",
    age:12
}

function test(obj:Animal) {
    for (let k in obj) {
        console.log(obj[k]). //Error here}
}
test(animal)

function test(obj:Animal) {
    for (let k in obj) {
        console.log((obj as any)[k]) //No error}
}

type Animal = {
    name: string;
    age: number;
    [key: string]: any
}

const animal:Animal={
    name:"dog",
    age:12
}

function test(obj:Animal) {
    for (let k in obj) {
        console.log(obj [k]) //No error}
}
test(animal)

function test<T extends object>(obj:T) {
    for (let k in obj) {
        console.log(obj [k]) //No error}
}

function test(obj:Animal) {
    let k: (keyofAnimal);
    for (k in obj) {
        console.log(obj [k]) //No error}
}