Home › Articles 2023–24 › Recognizing heat cycles in female deerhound bitches: signs and timing
Understanding the reproductive cycle of an intact female deerhound—commonly called “coming into season” or “in heat”—helps you manage her care appropriately and make informed decisions about whether spaying is right for your dog. Large-breed bitches follow the same reproductive pattern as all dogs, though timing and physical signs vary individually.
The estrous cycle: four phases
The canine estrous cycle has four distinct phases, occurring roughly twice per year in most bitches, though some dogs cycle once or three times annually.
Proestrus lasts five to nine days and marks the beginning of heat. During this phase, the vulva swells and the bitch releases a pheromone scent that attracts male dogs. You may notice vaginal bleeding or bloody discharge (often described as “color”), which is the most visible early sign. The bitch is not yet fertile and will not accept mating. She may seem restless, more affectionate, or mark more frequently (for example, by urinating in the house).
Estrus lasts approximately seven to thirteen days, with larger and more mature dogs sometimes experiencing longer cycles. During estrus, the bitch is fertile and will accept mating. The discharge becomes paler or watery. She may stand to be mounted and show obvious changes in behavior—mounting other dogs, ignoring commands, or extreme restlessness. Her tail may be carried to the side. This is the period when unplanned mating is most likely if she is loose or poorly supervised.
Diestrus follows estrus and lasts about 60 days. Bleeding stops, the vulva returns to normal size, and behavioral changes subside. If she is pregnant, puppies develop during this phase. If not pregnant, hormone levels decline gradually.
Anestrus is the resting phase between cycles, lasting roughly 90 to 150 days. The bitch shows no reproductive signs and is indifferent to males.
When do large-breed bitches first come into season?
Most dogs have their first heat cycle (called first season or maiden season) at around six months old, though this varies a great deal and can be as late as two and a half years old—larger and giant breeds, including deerhounds, tend towards the later end of that range. This variation is normal. First seasons are often lighter (less obvious bleeding) and shorter than subsequent cycles. Do not assume a young bitch cannot become pregnant just because she is young; even a young, small-looking female can conceive if she comes into season and has contact with an intact male.
Signs your bitch is in season
The most obvious sign is vaginal discharge, which starts as blood-tinged and darkens, then becomes paler or clear as estrus progresses. Some bitches are fastidious and keep themselves very clean, so discharge may not be obvious; look for blood spots on bedding or floors.
Behavioral changes are often dramatic. Your bitch may become restless, pace constantly, whine, or refuse to settle. She may seem affectionate and seek attention more than usual, or conversely become uncharacteristically aloof. Scent marking increases—she may urinate more often, even in the house or on furniture, depositing pheromones to signal her fertility.
Physical changes include vulval swelling (sometimes dramatic, sometimes subtle) and changes in how she sits or moves. She may stand differently, raise her tail to the side (flagging), or turn her rear toward other dogs. Some bitches lose their appetite during heat, while others show no change.
Attention from male dogs is a reliable sign. Intact males from some distance away will detect pheromones and may seem obsessed with your bitch even if you cannot see obvious heat signs.
Managing your bitch during season
If you are not planning to breed, keep your bitch indoors or in a secure, high-fenced garden away from intact males. Even a well-trained bitch in heat may ignore recall commands if a male appears. Never leave her unsupervised. Some owners use doggy pants with absorbent pads to manage discharge indoors; these reduce marking and mess but do not prevent conception if an intact male penetrates the barrier.
Avoid dog parks, shows, training classes, and other public gatherings where she might meet intact males. If you walk her on lead in public, keep walks brief and be aware of male dogs approaching. Some bitches become anxious or irritable during heat; provide a quiet, safe space and routine to help her cope.
Bathing during heat is fine, though avoid swimming in open water (ponds, lakes, rivers) where bacteria introduced during the open vulva phase could cause infection.
Breeding considerations
If you intend to breed, work with a responsible breeder mentor. The fertile window is roughly around the ninth to fourteenth day of estrus, though this varies individually. Ovulation occurs 24 to 48 hours after a hormone peak, timing that a vet can help identify through blood tests. Breeding at the optimal time maximizes chances of conception. Pregnant bitches carry puppies for approximately 63 days (roughly 9 weeks) and require extra nutrition during the final third of pregnancy and while nursing.
Breeding carries risks for the dam: pregnancy loss, difficult labor, uterine infection (pyometra), and other complications. Responsible breeders ensure bitches are health-tested before breeding and do not breed excessively.
Spaying (ovariohysterectomy)
Spaying before the first heat substantially lowers the lifetime risk of mammary tumours compared with spaying later or not at all, and it removes the risk of pyometra and ovarian or uterine cancer entirely. These are significant health benefits.
However, spaying also has trade-offs in large-breed dogs. Spaying before full skeletal maturity is associated with an increased risk of orthopaedic conditions, particularly in larger breeds. In large breeds including deerhounds, waiting until closer to full skeletal maturity before spaying may reduce this orthopaedic risk, though every individual dog’s growth rate differs.
Current veterinary guidance from the British Veterinary Association notes that neutering is generally best timed between around 12 and 23 months, with larger breeds taking longer to mature, and that early neutering (before 6 months) is associated with a higher risk of orthopaedic conditions. There is no single “best age” that suits every dog. Instead, discuss your individual bitch’s circumstances—family history of cancer, orthopedic concerns, reproductive plans—with your vet to decide what timing makes sense.
Pyometra: a serious condition
Pyometra is a life-threatening infection of the uterus that develops in the diestrus phase following heat. Signs include vaginal discharge (often foul-smelling and bloody), lethargy, vomiting, abdominal distension, and fever. Pyometra requires emergency surgery to remove the infected uterus. Prevention through spaying is one option; vigilant monitoring and prompt veterinary attention if signs appear is critical in intact bitches.
Incontinence after spaying
Some spayed bitches develop urinary incontinence later in life, thought to be related to loss of hormones that support urinary sphincter function. This is more common with very early spaying. If your dog develops incontinence after spaying, discuss medications and management with your vet; several treatment options exist.
Key points
- Female deerhounds cycle roughly twice yearly, lasting about 3 weeks from start of proestrus to end of estrus.
- First heat typically occurs from around 6 months old but can be much later, especially in large and giant breeds.
- Visible signs include vaginal discharge, behavioral changes, vulval swelling, and scent marking.
- Keep intact bitches in heat away from intact males to prevent unplanned mating.
- Spaying has health benefits (tumor prevention) and risks (joint disease) in large breeds; discuss timing with your vet.
Related: Deerhound help near you