Sex

Similar to other big breeds, bullmastiffs sometimes do not attain sexual maturity until much later in life compared to smaller breeds. Estrus, the first heat cycle, may occur in female Bullmastiffs between six months and two years of age. To give them enough time to mature emotionally and physically, it's best to wait until they're around 18 to 24 months old before thinking about breeding them.

A Bullmastiff female is most amenable to mating during her estrus cycle. About every six to nine months, this cycle repeats. During estrus, a woman's vulva swells, she may vomit blood, and she may be more extroverted and friendly, especially towards male canines. You should consider marrying your Bullmastiff at this time since it is the best season for breeding.

The estrus phase is the most common time for male Bullmastiffs to mate with females. Both dogs must be in good health, fully grown, and tested for any relevant conditions before breeding may take place. When breeding dogs, it is important to take into account their family trees, medical histories, and compatibility to ensure that no genetic disorders are passed on.

If the Bullmastiff mating goes well, the mother dog will be pregnant for around 63 days, giving or taking a little more or less. She is going to experience a lot of bodily changes as her body gets ready to give birth during this period.

Giving birth is referred to as whelping. The number of pups born to a mother Bullmastiff may vary from one or two to several. To keep the mother and pups safe and healthy during whelping, close observation is required.