weird equilibrium issue

One of the breeder females I started out with recently started having some weird problem. She's very spastic, moving her head in circles and running around, obviously off balance. She's fairly young, only had one litter with me with no issues. I did recently start adding dog food to my feed for her as well as all my other rats, but she seems to be the only one affected? Is it possible this will clear up on its own, is there anything I can do for her, or should I just go ahead and euthanize her/feed her off?

Sounds like what I am told is an ear infection.

Sounds like it's either an ear infection or some kind of neurological issue.

Putting her down will probably be your best course of action, she'll need to be taken to the vet or given antibiotics otherwise.

Ear infection or brain tumor is most likely cause.