The first thing you may want to consider is an appointment with your GP to rule out bronchitis. I have severe asthma and thought I was having a major flare...went to the doctor and found out it was actually bronchitis...which is going around our area in a big way right now!

One thing to keep in mind, allergies get worse the longer and more often you are exposed to an allergin. So it is possible that you have "new" seasonal allergies. However, the timing really does seem to point to the dog. I have cats, and I have issues wit cat allergies. How I cope with it is....when the animal is actively shedding, vacuum every single day (brush or vacuum the furniture also. It is recommended to not let the animal in your bedroom if you are allergic; I can't bring myself to do that, my cats even sleep with me. So...I put a big sheet over the top of the bed in the morning, covering everything, including the pillows. The cats are free to lay on te bd, and at night I have a relatively cat hair free bed. Of course they leave har when they sleep with me, but then I brush the bed wit a lint brush every morning. Another thing that may help is frequent grooming of the dog. By a professional groomer. Frequency of grooming depends on the type of dog, some are sensitive, some are oily, etc. Check with a groomer or your vet to find out.

Good luck!