What does F1 , F1b, F2 Mean ?
When a King Charles Cavalier is mated to a poodle to produce a cavapoo this is known as a first generation cross and is referred to as an F1 .Sometimes a Cavapoo is mated back to one of the parent breeds either the cavalier or poodle and this produces an F1b. The "b" denotes back-bred.
When two Cavapoos are mated together they produce the next generation known as F2s. It is possible that a small number of the litter may have what is called the 'Grandad effect'. This is where a puppy will resemble one of the grandparents, either the poodle or the cavalier and is usually referred to as a throwback. This is why we don't breed F2.