The prize for the answer is braggin’ rights. Nowt else.

Complaint

My mistress bids me wait in durance stern.
With ignorance she blocks my path to joy;
Unjust delays are wrought at every turn,
My every plea set back by falsehoods coy;
Or else she seems to wilt, or then relent,
Yet in the granting, buck my earnest wish
With pale commital, watered-down assent —
A day-old tin of bleak and joyless fish.
Such cheapest chicken wafted at my face
That any cat would balk to call a meal!
There’s gravy when I wanted jellied plaice
Or tuna when I becked for curried veal!
That witch! that crone! a wight with no remorse!
I shan’t be coming back for second course!

Question

What colour is the cat who writes this complaint, AND WHY? No marks will be given for an incorrect reason. (Hint: You don’t need any foreknowledge of my household to work this out.)

Comments will be screened for a couple of days to let everyone guess.