Dogs can have allergies to many different things, and can acquire new ones at any time, just like people. Often times, it can be very challenging to figure out what your dog is allergic to, and sometimes it's a number of things.
If you're not sure what your dog is allergic to, and he needs a bath, it's best to stick with a simple shampoo with very few ingredients like Black Sheep Organics Allergy Free Shampoo.
Some dogs have seasonal allergies and pollen sticks to their coat. If this is your dog, washing the pollen off regularly will help alleviate his symptoms, and our shampoo is mild enough to use regularly.
Chemical sensitivities can trigger allergic reactions, and your dog may be picking up toxins on his feet and then ingesting them from licking his feet. If you live in a city, washing your dogs feet daily might help him.
Dogs can have allergies to household chemicals like floor cleaners, carpet fresheners, air fresheners, laundry soap, and dryer sheets.
Often times, allergies are food related, and it's a good idea to keep a journal of your dogs food and daily routines when trying to determine what he is allergic to.
Lastly, a veterinarian can perform an allergy test, which can take care of a lot of the guess work for you.