Fall is a big problem for many pets when it comes to allergies. Big allergy seasons are spring and fall.
Some things to watch for include:
1. foot licking, face rubbing/scratching
2. Rashes, patches of redness
3. Repeat ear infections and head shaking
4. Repeat skin infections
5. Patchy hairloss
Your veterinarian can help with these issues and together come up with a plan.
Here is a link to more information
http://www.pethealthnetwork.com/dog-health/dog-diseases-conditions-a-z/why-my-dog-so-itchy