Another thing the family friends did that helped me to overcome my fear was to let their dogs be in the room with us, but on their leads and with the handle end anchored under the leg of the chair they were sitting on.
So I was in the same room as my nemesis and learning how it behaved & reacted, but safe in the knowledge that it couldn't get at me!
Gradually over time, that built my confidence such that I was able to approach the dog "on my terms" knowing I could back away if Fido got too boisterous for my liking.
They didn't keep the dog on the lead or locked in a room for the whole visit - The dogs needs always came first and I fully understood that I was in their home and it was "my problem".
But looking back, it was those "controlled" times when dog & I were in the same room but the owner was holding the dog by its lead or collar so it couldn't "get me" - That helped me build my confidence.
To those posters asking about dogs in the streets - Yes, I'd cross the road or give them a very wide berth whilst keeping my eye on them until they were safely down the street & out of sight.
If there was a dog off lead in a park - I wouldn't leave my parents side.
I don't recall "therapy dogs" being a thing back then, but I was fine with guide dogs. In my eyes, they were special dogs like Spot or the Andrex Puppy. My mind never made the connection that beneath that cute obedient nature - they're just a dog.
OP - Is your DB also nervous of dogs? One of my parents were, so that probably went some way towards my phobia - The one person in my life who, in my 12 year old eyes, can fix any problem - was also afraid of dogs so wasn't able to be that reassuring to me.