It's better to allow your female to have one litter before she is spayed. It is important for children to witness the miracle of birth. An unneutered pet has the urge to roam and seek out mates. Neutered pets are freed from this urge and become a calmer, more content family member who wishes to stay home and be loved. Your pet will be healthier.
Neutered pets are less likely to roam out into traffic or get injured in fights.
They have twice the life expectancy and are less likely to develop breast, uterine, prostate, or testicular cancers. You won't have to deal with staining or spraying. Unspayed female dogs and cats go through heat periods and experience a flow of blood. Unneutered males mark their territory with strong smelling urine. Altering pets eliminates these problems.