I’d treated her earlier this summer with no side effects but she reacted this way after being treated more recently. I’ve toweled her off now and she seems to be leaving the spot alone. Still I’ve discarded all the remaining treatment, and am going back to a rabbit specific brand.

She’s eating and playing normally, but she did give me a bit of scare.

Don’t worry I didn’t use front line. I’d thankfully already learned about the dangers of that brand. I guess I can’t rule out behavioral. She could be acting up because I’ve started switching her food to a lower calorie adult diet. She normally ate wild harvest brand pellets, and alfalfa hay. She’s since been switched to timothy hay (with a tiny pinch of alfalfa as a treat) and small world pellets which have a much smaller fat content. I wonder if she’s pouting about her food not tasting quite as good. She also gets fresh greens to keep her happy and healthy including mustard greens, romaine lettuce, and sometimes spinach. I’m actually still gradually switching her food by mixing the new old brands together, so that it’s not a drastic change. She’s noticing the difference though.

Today is an improvement at least. I wonder if she’s acting out of boredom or loneliness. I play with her for several hours a day, and she gets plenty of out of the cage time (usually about 6 hours), and has lots of toys. But maybe she wants a friend. I don’t know if I have the space or funds for a second bunny right now though.

I’ll watch her closely for the next few days and see if she stops with the discontinuation of the flea treatment.

Update:
Nel still appears to be in good health and happy. The flea treatment doesn’t seem to have caused any harm. The fur is starting to grow back, and she hasn’t chewed on it that I’ve seen. I’ve seen her lick there but not chew. I still have no clue as to why she did it in the first place. The flea treatment or the fleas themselves, but in either case both are gone now (until that flea ridden cat that keeps pulling off his flea collar brings more in).

At this point Nel doesn’t seem to even notice a problem and is wondering what I’m so worried about. She seems to know when I worry and gets extra affectionate around those times.

Well the fur is growing back a bit now, but it’s still kind of thin. the spot hasn’t gotten any bigger so I know she’s stopped messing with it at least. Nel doesn’t seem to even notice a problem, so it seems she’s fine. In fact she’s sitting next to me right now.

Thanks for the concerns from everyone. BTW she’s also getting used to her new food (with a little help from kaytee healthy toppings papaya)