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Hello guys.
I have a facebook page about dogs, and it used to get lots of posts likes
out of 2900 page likes.
In the last few days I saw a decrease in my page likes. I used to have 2900+
and now I have 2850+. How's that possible?

Second, I'm uploading a post once a day usually a cool video. Those videos
were getting lots of views, but now barely 100 !!

What has happend ?! And how can I get back on track?

Maybe facebook change your account from "personal" to "page".
With that change, the new posts does not post on your friends wall.

facebook should inform you about that (if that happens)

But it's a facebook page.

FB new algo decreased the reach significantly. It's not only you.

Yup, Facebook is changing rules from time to time. Try paying an ad.