FJ funnily enough the few I have seen have been fantastic, not the normal health issues you see in pugs or cavies. No heart defects, eye issues, ear issues, skin issues.... no brachycephalic issues.... good temperments... overall a bit more energetic than the Cavalier King Charles Spaniels (cavies for short).

We had one in last week which we were all in love with, it had been hit by a car...