Good puppies start long before breeding ever takes place. Both parents need long-term care -- what dog people call conditioning -- to produce the best offspring. This means regular veterinary care, screening for genetic problems, pre-breeding tests, and regular exercise and good nutrition.
A universally unique identifier (UUID) is an identifier standard used in software construction. A UUID is simply a 128-bit value. The meaning of each bit is defined by any of several variants. For human-readable display, many systems use a canonical format using hexadecimal text with inserted hyphen characters.
1 When an Object is modified in-world, it is not assigned a new asset UUID until it is derezzed, copied back to inventory or during sim-state save. Modifying an instance of an asset will not update other instances or inventory copies.  Brand new notecards are just asset wrappers without an asset.