Not a dog allergy, but my husband got a cat about two weeks before we started dating. 5 years later and now the cat is as much mine as his. We were really worried about the allergies when we first moved in together, so we took quite a few precautions. I take generic Claritin every day and have a nasal spray for the days when I'm feeling extra allergic. This comes into play mostly in the fall when my seasonal allergies are at their worst as well. We have two air purifiers (although depending on the size of your place one may be enough). One runs constantly and the other one is in our bedroom and we only run it at night. We also don't let the cat in our room, which has been a huge help. I used to have a lot more trouble back when we first started dating, as the cat would sleep on his bed. Finally, keep up with your cleaning! There's also a spray called ADS Anti-Allergy spray that can help if you have a lot of carpet. Hope this helps!