One suggestion I would make, is for groups of trained animals: if you want them to learn to attack (or other trick) both as a group and individually, each should be a separate trick, one for group, a second for individual.
Animals shouldn't ever regard command words used in ordinary conversation as actual commands. Tone and inflection have a huge impact on the sound, and commands are practically never given in a conversational tone, plus hand gestures often accompany many commands, and if that is missing, the animal will not recognize the command.
Edit: The razor boar is in the back of MM2 because it was taken from a 3rd party book (with permission), and is therefore not actually property of WotC. And, the 3.5 update changed it to a magical beast.