So Chan eil means is not, but Chan eil ... [agam] means [I] do not have ... ?
Chan eil [X] aig [Y] = [Y] does not have [X]
(lit. Is not [X] at [Y])
Okay so if I'm not mistaken this should say 'the pig is not mine'. Maybe I have a number of pigs but this one sure and sht aint mine