you don't live with them either.....you can not tell someone to get rid of there dog so you are just no t going to be compatible house mates....I thought the same and I finally gave in and moved in with someone who had two dogs...I ended loving those dogs, it was really kind of a nice unexpected surprise that I grew to really enjoy the company of a dog. Living with other people means making major compromises all the time. You obviously like the person enough to live with them so why not like the dog too, dogs usually take on the personality of the owner anyway

I would think twice before issuing that ultimatum. There is often a very close relationship between a pet owner and the pet. This is especially true when the owner and the pet live alone (or just with each other). To ask someone not to get a pet is completely different than asking them to give away a beloved friend. In lieu of making this demand, I would consider why you object to the dog. Are you allergic? Have you had a bad experience in the past? Does the dog stink? Do you prefer cats? Also, I would try to make friends with the dog. Unlike cats, dogs are usually eager to please and respond well to petting, praise, walks, etc. If you can establish a relationship with the dog, it might not seem so objectionable. If none of this works, you will have to make a difficult decision about how much you value your significant other. Can you put up with the dog to have his or her companionship and love? Also, you don't really know someone until you live with them for awhile. Your SO may have traits or habits that are far worse than the dog. (This may sound harsh, but also consider the dog's age and health.)