Spaying—removing the ovaries and uterus of a female pet—is a veterinary procedure that requires minimal hospitalization and offers lifelong health benefits. Only outstanding animals should be bred. Great conformation, looks, personality, genetic quality and lineage is the key. In Europe only pedigree high quality show pets are allowed to breed to ensure lesser amount of genetic problems. If your pet is not going to be bred or is done breeding she should be spayed to prevent her from deadly diseases. Below is the list of explanations why spaying is better.
1. Your female pet will live a longer, healthier life.
Spaying helps prevent uterine infections (Pyometra) that cause build up of the pus in the uterus, possible uterine rupture and a massive infection of the entire body (sepsis) and death. Immediate surgical removal of the ovaries and infected uterus is the only treatment and can cost over $1500.00 comparing to the routine spay that cost around $150. This condition is very common and happen usually at older age when anesthesia is much riskier than in a young and healthy animal.
With each consecutive heat your pet is also at high risk of mammary (breast) cancer, which is
fatal in about 50 percent of dogs and 90 percent of cats. Most of the mammary tumors in pets are malignant and do spread (metastase) to other organs – bones and lungs.

2. Your spayed female won’t go into heat.
While cycles can vary, female felines usually go into heat four to five days every three weeks during breeding season. In an effort to advertise for mates, they’ll yowl and urinate or bleed more frequently—sometimes all over the house!

3. Spaying or neutering will NOT make your pet fat.
Lack of exercise and overfeeding will cause your pet to pack on the extra pounds—not spaying. Your pet will remain fit and trim as long as you continue to provide exercise and monitor food intake.

4. It is highly cost-effective.
The cost of your pet’s spay surgery is a lot less than the cost of having and caring for a litter. It also beats the cost of treatment of pyometra, C-Section, Puerperal eclampsia or chemotherapy.You can also prevent your pet from getting run over by a car or getting attacked by another pet in the quest of looking for mates.

5. Spaying your pet is good for the community.
Stray animals pose a real problem in many parts of the country. They can prey on wildlife, cause car accidents, damage the local fauna and frighten children. Spaying and neutering packs a powerful punch in reducing the number of animals on the streets.

6. Your pet doesn’t need to have a litter for your children to learn about the miracle of birth.
Letting your pet produce offspring you have no intention of keeping is not a good lesson for your children—especially when so many unwanted animals end up in shelters and are killed. There are tons of books and videos available to teach your children about birth in a more responsible way.

7. Spaying and neutering helps fight pet overpopulation.
Every year, millions of cats and dogs of all ages and breeds are euthanized or suffer as strays. These high numbers are the result of unplanned litters that could have been prevented by spaying or neutering.