The last couple of days my dog has been sneezing a lot lately. She's not coughing or anything else. At first I thought it may be allergies but I have no idea what she would be allergic to. I did recently switch back foods from Purina Dog Chow to Purina Pro Plan Focus 26/12 but I would not think that the food would be the issue since this is what she ate for the first 7-9 months I had her. She has been on Dog Chow for the last 6 months or so and just switched back since I can afford the Pro Plan again. This got me thinking that she may have a respiratory infection of some kind after doing some research on the web. We do frequent a public training area almost daily but the only dog she has come in contact with in last week before she started sneezing is my friends puppy who has not been sneezing or had any symptoms of anything else. She has been a little lethargic the last few days as if she is tired but once we get out to train she still has her drive and everything still. The sneezing started about 3 days ago. I am going to take her to the vet this week if she does not get better. Anybody have any ideas what this may be? respiratory infection? Allergies? I'm kind of in the dark since this is my first dog. She never had any allergies last year during the spring and its been raining a lot lately here so there hasn't been much pollen in the air.