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Good morning, I am Laura, one of the UK vets.
I would avoid the dilute colours of bulldog (lilac, blue) as to me they are over-represented in skin disease. I don't see much colour dilution alopecia that they mention in the bulldog clubs, but I do see a lot of allergic skin disease, and in some cases we have been unable to control the inflammation, unlike in other dogs, leading to the affected dogs being put to sleep between the ages of 2 and 5.
The French Bulldog Club of England explains it more here:
Generally this applies to all bull breeds, not just the French Bulldog.
You need to be careful with Frenchies in general - being a breed with a squashed face many have a liffetime of breathing difficulties (you may know this already). You need to make sure the nostrils are open and there is minimal breathing noise. Look up pictures of 'stenotic nares' and try and get a good a pup as possible. The nostrils are only one part of Bracycephalic Obstructive Airway Disease but they are a good start.
In my experience most tend to get the problems regardless of care :(
You are welcome, any further questions let me know!