Why is my gerbil losing toenails

Please do the right thing and separate them immediately. You wouldn't appreciate if I left you in a cage with someone who was constantly biting and scratching you. :(

If you're not willing or able to buy a completely different cage and toys and keep them completely separate, then you must choose. You choose the one you want to keep and do the responsible thing and put the other one up for adoption through your local Humane Society.

There, someone like me will come along and adopt it - especially if it's not very tame and it's older - and we will give it a good understanding home.

If there is any reason to think your Humane Society may not be able to find it a home then your local PetSmart or PetCo will take it and adopt it out.