Hi,
I'm not sure what you mean?
Do you mean kink like the spinal deformity seen in caramels? If so then no they shouldn't do that at all.
The tail change most often talked about with ovulation is the "tail suck" which simply means the tail looks as though all the fat has been sucked out of it and that only lasts during the 12-24 hours of the ovulation itself from the few examples I have seen here.
One of my females has huuuuuuuuge builds which tricks me every single year.
But it does mean I have pictures to show the difference in the tail during the real ovulation. These pics are from 2008 but she did it to me again in 2009.
Building.
The real ovulation.
See the difference in her tail?
dr del