"My mastiff bit Isaac but we rehomed her with a very heavy heart. Not because we didn't love her," the Teen Mom star tweeted on December 23.
Now, with a brand new baby in the house and still a couple of canines running around, Kailyn has to be extra careful, but fortunately she has the help of her Frenchie, who is standing guard like a sentry next to her newborn, Lincoln.
"Does anyone else have a Frenchie that guards their newborn? I just didn't expect this at all!" she captioned the adorable photo.
A lot of Kailyn's fans chimed in, saying their dogs had done that with their little ones, too.
Have you ever seen a dog guarding a baby like that?
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Gallery | Celebrity Babies