I think I found a bug...
I'm playing on hard!
On the third mission (La Rochelle Part I), you can find dog food and narcotics and you can mix both as usual, the problem is that none of the dogs would eat the poisoned meat when you trow it for them.
Dogs do go to eat the non poisoned meat though.
P.S.: The mod is great, by now the only thing that I disliked is the super short range of the metal detector
Maybe this is an IQ dog.