A. If the pus really isn't all that bad, and it's just some discharge, your pup may benefit from a diet change. It could be that the food you're feeding just isn't right for your dog, and that's okay! Dogs grow and change over time, and now that your dog is fully matured, a diet change may be in order. Try something like Taste of the Wild, maybe a grain free dog food, Orijen, or Ziwipeak. These are all really great food options.
If the pus is really bad, and continues to get worse, see your vet again and let them know what's going on. Maybe you could try a diet change, and then see if there are any improvements.
Remember, you should always gradually change a dogs diet. By gradually, I mean you put a tiny bit of new kibble in with a bowl of the old kibble. Reduce the old kibble by just a few bits of kibble. Throughout the course of at least two weeks (or as long as you want depending on whether or not you want to finish off the old food) you slowly add more of the new kibble while removing some of the old kibble. This makes the process gradual, and won't cause any tummy-upset in your dog.
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