Milk cannot be treif. Only a non-shechted tahor animal can be treif. Pig is not treif – it is not kosher. Kosher meat mixed with cholov Yisroel is not kosher, but it most certainly is not treif.
Milk can be from a lo tahor source, but that type of milk is not sold in this country as USDA Grade A milk. I am tired of people calling things treif that cannot be treif, when they really mean “not kosher.” It’s like calling fruit glatt kosher.