Hi OP - as someone who has been recently diagnosed with a dog dander allergy, just adding my two cents.
We got a dog last spring (he's been with us 8 months. Can't believe it's only 8 months...I can't imagine life without him now!).
I've always been 'atopic' - have eczema, hay fever etc (June weddings in fields are absolute hell for me!). Never knew I had a pet allergy though as had never had a dog before.
Allergies often take a while to develop after prolonged exposure, and sure enough, after about four months of having the dog with us, one day my eyes were red, my throat was closing up and my nose was blocked constantly. Hey presto, from that day onwards - dog allergy!
I knew what it was, but got an IgE test done at the GPs anyway. Results came back and my allergy was 'off the scale', GP said. He told me the best remedy was to remove the dog (was equally ambivalent about the efficacy of immunotherapy as another poster's GP had said), but I am very happy to say that we haven't had to.
My allergy is much more manageable now due to a number of steps taken (and advice I found on MN too, so sharing what I found now). Obviously I don't know how allergic your DP is (he can very easily get the immunoglobulin test done and find out), but here's what I did:
- buy a (v expensive, but v effective) HEPA air filter. Mine was circa £200. Worthwhile if choice is DP or dog!
- wash dog weekly with anti allergy shampoo
- wash clothes and bedding with anti allergy detergent
- take an antihistamine daily (no evidence of anything wrong with long term use)
- Antiallergen products eg. PetalCleanse - you can get sprays for furniture and wipes for the dog
- inhaler and nasal sprays like Flixonase if necessary
These steps have helped me immeasurably. I get my DH to do the grooming and vacuuming as doing so stirs the dander up.
Wooden floors are best.
If he's not at anaphylactic-shock-levels of a dander allergy, the prognosis (from my own experience) is good.
We haven't had to get rid of our beloved dog.