"Shizheʼé łééchąąʼí bił yáʼátʼééh."

Translation: My dad likes dogs.

[brjaga]

What is the purpose of bił in this sentence?

[deactivated user]

bił yáʼátʼééh = he/she likes

bił here is a propositional pronoun that means "with him/her" or "in his/her company." When it is put with yáʼátʼééh (as a verb, this mean "is good, fine, agreeable"), it is the idiomatic way of expressing that someone likes something.
A bit more literal translation would be "X is good with him."

To use this constructions with other pronouns, you have change the prefix accordingly:

shił yáʼátʼééh - I like

nihił yáʼátʼééh - we like

dił yáʼátʼééh - you (singular) likes

[Judorange123]

Correction: for "you like it", itʼs "nił yáʼátʼééh", unless you like blood :)

[Ccf-Uk]

Ahéheeʼ!

[Jegge4]

Well, father is a 'HE'

[MariaChick1]

I have no idea what the words sound like

[DavyDesh1]

Why is there a word for "she" in there, when it is talking about your dad?

[SariahLily]

"Bił yáʼátʼééh" means "he likes" or "she likes," depending on context. In this sentence it means "he likes."