I just did the Kagremuz quest and found out I could have a dwarven animunculus as a pet. (Actually, I only found out after I already killed the spider. Doh! I was just about to kill the sphere when I noticed the talk option.)

So I thought it would be interesting to take the new "pet" to my Lakeview home. Big mistake! Lucia kept following me all over the house and even outside and constantly tried to dialogue with me. My only solution was to fast travel back to Solstheim and tell the sphere to go home.

Anyone else have the same problem? What about Riekling "pets?" Do they glitch out the kids as well?

Probably, the pets from Dragonborn are for you, not children. When I get that far anything I adopt will be staying in Solstheim.

You accidentally kill them.....they respawn.

Edit: fast

Also glitched my Blaise the same way