And lets not forget that being collared can also be "conditional".

To be frank:

If you are adamantly against the treatment that you are recieving at your partner's hands, (especially if its not safe, sane or consensual) you have a responsibility to yourself as a human being to stand up and do somthing about it, pet, sub, slave or otherwise.

A wise and understanding dominant shouldn't have any problem with that and you should never fear of comunicating such conditions.

(In fact one would think that he or she should have perhaps insisted upon knowing what your limits were in some way before entering into any relationship with you to begin with)

I shall pray that if this is a situation between you and your dominant, that it is resolved honorabely and in a timely and harmonious manner.