Depending one the age and weight of the animal.If it is real young 6 months and younger I'd say give it another week then worry. A late 06 Oct/Nov or around that date born should not be refusing food. Check all the temps and let me know if your right on there I give you a laundry list of things to try before you worry.

P.S I have a male pastel that did this to me before I found his little trick..

Take a deap breath and I'll et with you tomorrow.