Berners and Poodles have vastly different coats.
Bernese Mountain Dog standard:
Coat: The coat is thick, moderately long and slightly wavy or straight. It has a bright natural sheen. Extremely curly or extremely dull-looking coats are undesirable. The Bernese Mountain Dog is shown in natural coat and undue trimming is to be discouraged.
Poodle standard:
Coat: (a) Quality - (1) Curly: of naturally harsh texture, dense throughout. (2) Corded: hanging in tight even cords of varying length; longer on mane or body coat, head, and ears; shorter on puffs, bracelets, and pompons
Keeping in mind that even in a purebred dog you will still wind up with dogs who have an incorrect coat, and that most purebred dogs used in designer cross breeding programs are typically not well bred themselves, mixes between two breeds like that can have coats all over the place, and require more extensive grooming than either parent breed.
Also, keep in mind that puppies can undergo several coat changes before they get their adult coat. If they are undergoing a major coat change, then their current coat can look a lot shorter than it will in a few months.
Most designer mix breeders are either uninformed themselves, or will deliberately mislead puppy buyers. There is no such thing as a truly hypoallergenic dog. There are breeds, typically single coated breeds (like Poodles), that do seem to be less likely to trigger allergic reactions, but even that can vary within the breed, with some dogs producing more dander, etc. than another. If your child has been tested, and found to have a very strong reaction to dogs, then there is a good chance that a mixed breed dog isn't a good idea.
Bernese Mountain Dog standard:
Coat: The coat is thick, moderately long and slightly wavy or straight. It has a bright natural sheen. Extremely curly or extremely dull-looking coats are undesirable. The Bernese Mountain Dog is shown in natural coat and undue trimming is to be discouraged.
Poodle standard:
Coat: (a) Quality - (1) Curly: of naturally harsh texture, dense throughout. (2) Corded: hanging in tight even cords of varying length; longer on mane or body coat, head, and ears; shorter on puffs, bracelets, and pompons
Keeping in mind that even in a purebred dog you will still wind up with dogs who have an incorrect coat, and that most purebred dogs used in designer cross breeding programs are typically not well bred themselves, mixes between two breeds like that can have coats all over the place, and require more extensive grooming than either parent breed.
Also, keep in mind that puppies can undergo several coat changes before they get their adult coat. If they are undergoing a major coat change, then their current coat can look a lot shorter than it will in a few months.
Most designer mix breeders are either uninformed themselves, or will deliberately mislead puppy buyers. There is no such thing as a truly hypoallergenic dog. There are breeds, typically single coated breeds (like Poodles), that do seem to be less likely to trigger allergic reactions, but even that can vary within the breed, with some dogs producing more dander, etc. than another. If your child has been tested, and found to have a very strong reaction to dogs, then there is a good chance that a mixed breed dog isn't a good idea.