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🐾 Complete Guide to Spaying (Neutering) in Female Dogs

For Veterinary Professionals — Easy English, Full Sequence

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📌 WHAT IS SPAYING?

Gold Standard in most countries = Ovariohysterectomy (OHE) Both techniques are acceptable. OE has slightly less tissue trauma, but OHE removes all risk of future uterine disease.

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📋 SECTION 1: PRE-OPERATIVE ASSESSMENT (Before Surgery)

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1.1 History Taking

• Age, breed, weight
• Last heat cycle — when was last estrus?
• Is she pregnant? (palpate abdomen, ultrasound)
• Is she in heat right now? (increased bleeding risk — delay if possible)
• Any previous surgeries or illnesses?
• Current medications (especially NSAIDs, anticoagulants)
• Vaccination status
• Any vomiting, diarrhea, lethargy recently?

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1.2 Physical Examination

• Body weight → for drug dosing (mg/kg)
• Temperature, Pulse, Respiration (TPR)
  • Normal temp: 38.3–39.2°C
  • Normal HR: 60–140 bpm (varies by size/breed)
  • Normal RR: 18–34 breaths/min
• Mucous membrane color → pink and moist = good
• CRT (Capillary Refill Time) → should be < 2 seconds
• Hydration status → skin turgor test
• Auscultate heart and lungs → rule out murmur, arrhythmia, lung crackles
• Abdominal palpation → pain, masses, organomegaly, pregnancy
• Lymph nodes → check for lymphadenopathy
• Body Condition Score (BCS) → 1–9 scale (ideal = 4–5)

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1.3 Pre-operative Blood Work (Minimum Database)

🔑 Young healthy dogs (<5 years) with no signs — minimum CBC + chemistry is acceptable. Older dogs (>7 years) need full bloodwork + chest X-ray.

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1.4 Patient Classification — ASA Status

Most routine spays are ASA I or II.

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1.5 Fasting (NPO)

• Adult dogs: Food withheld 8–12 hours before surgery
• Water: Can have water until 2–4 hours before
• Puppies (<12 weeks): Fast only 3–4 hours (hypoglycemia risk!)

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1.6 Timing of Spay — Important Considerations

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💉 SECTION 2: ANESTHESIA PROTOCOL

2.1 Pre-medication (Pre-med)

⚠️ Avoid acepromazine in: epileptics, Boxers (vasovagal syncope risk), hypovolemic patients.

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2.2 Induction

• IV catheter placed (cephalic vein most common)
• Flush with saline before and after drugs

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2.3 Maintenance

• Intubation with appropriate endotracheal tube
• Maintain with Isoflurane (1.5–2.5%) or Sevoflurane in oxygen
• Monitor end-tidal CO₂ (ETCO₂): target 35–45 mmHg
• IV fluid support: 5–10 mL/kg/hr Lactated Ringer's or 0.9% NaCl

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2.4 Monitoring During Anesthesia

🔑 Anesthetic depth signs:

• Too light: swallowing, movement, tear production, palpebral reflex
• Too deep: no reflexes, cardiovascular depression, apnea

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🔪 SECTION 3: SURGICAL PREPARATION

3.1 Positioning

• Dorsal recumbency (back lying down, legs extended or gently tied)
• Slight Trendelenburg position (head down) helps intestines fall cranially

3.2 Clipping

• Clip from umbilicus → pubis (midline ventral abdomen)
• Width: at least 5 cm on each side of midline
• Use #40 blade for closest clip

3.3 Skin Preparation (Aseptic Scrub)

• 3-step alternating scrub:
  • Chlorhexidine 4% scrub → sterile gauze → 70% isopropyl alcohol
  • Repeat 3 times minimum
  • Work from center → outward (never back toward center)
• Final prep with chlorhexidine solution or povidone-iodine spray
• Allow to dry before draping

3.4 Surgical Draping

• Sterile fenestrated drape over patient
• Only incision site exposed
• Drapes secured with towel clamps

3.5 Surgeon Preparation

• Surgical hand scrub (5–7 minutes)
• Sterile gown and gloves
• All instruments on sterile field

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✂️ SECTION 4: SURGICAL TECHNIQUE — OVARIOHYSTERECTOMY (OHE)

4.1 Instruments Needed

• Scalpel handle + blade (No. 10 or No. 15)
• Mosquito forceps (curved + straight)
• Halsted mosquito forceps
• Allis tissue forceps
• Metzenbaum scissors
• Mayo scissors
• Thumb forceps (tissue + dressing)
• Retractors (Gelpi or Balfour)
• Needle holder
• Suture materials
• Spay hook (for locating uterine horns)
• Gauze sponges
• Irrigation syringe

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4.2 Step-by-Step Surgical Procedure

STEP 1 — Skin Incision

• Location: Midline, from just caudal to umbilicus → toward pubis
• Length:
  • Small dogs/cats: 2–3 cm
  • Medium dogs: 3–5 cm
  • Large dogs: 5–8 cm
• Incise skin with scalpel in one smooth motion
• Incise subcutaneous fat down to linea alba

STEP 2 — Entering the Abdomen (Celiotomy)

• Identify the linea alba (white fibrous midline — avascular)
• Tent linea alba with thumb forceps
• Make small stab incision with scalpel
• Extend incision cranially and caudally with Mayo scissors
• Insert Gelpi retractors to hold open

STEP 3 — Locate the Uterus

• Use spay hook or index finger
• Hook is swept along the lateral body wall to catch a uterine horn
• Uterus is Y-shaped: two horns + body + cervix
• Follow horn cranially to find ovary

STEP 4 — Isolate the First Ovary (Right side first — surgeon's choice)

• Identify the ovarian pedicle (contains ovarian artery and vein)
• Create a window in the broad ligament using a closed hemostat
• This allows placement of ligatures

STEP 5 — Ligate the Ovarian Pedicle (3-Clamp Technique)

[Ovary] — Pedicle — [Clamp 1 (crush)] — [Clamp 2 (crush)] — [Clamp 3] — Ovary side
         Ligature placed in groove of Clamp 1
         Cut between Clamp 2 and Clamp 3

• Clamp 1: Placed most proximal (toward body) — ligature goes here
• Clamp 2: Middle clamp
• Clamp 3: Most distal (toward ovary)
• Ligate ovarian pedicle with absorbable suture in the groove left by Clamp 1
• Use circumferential + transfixation ligature for security
• Cut between Clamp 2 and Clamp 3
• Remove clamp and inspect pedicle — no bleeding!
• Ovarian pedicle is released into abdomen

STEP 6 — Ligate the Same Side Broad Ligament

• Broad ligament = mesentery connecting uterus to body wall
• Tear by hand (avascular in most dogs) or ligate if vessels visible
• In fat dogs: always ligate broad ligament

STEP 7 — Repeat for Left Ovary

• Follow the uterine body to the other horn
• Repeat Steps 4–6 for the left ovarian pedicle

STEP 8 — Ligate the Uterine Body (Cervical Stump)

• Identify uterine body just cranial to cervix
• Place two ligatures on the uterine body:
  • First: circumferential ligature (proximal)
  • Second: transfixation ligature (distal to first)
• Use 0 or 2-0 absorbable suture
• Place one clamp distal to ligatures
• Cut between the clamps
• Inspect cervical stump for bleeding

⚠️ Critical: Ensure BOTH ovaries completely removed. If even a small piece of ovarian tissue remains → ovarian remnant syndrome (dog continues to cycle).

STEP 9 — Abdominal Lavage (if needed)

• If contamination occurred, irrigate with warm sterile saline
• Suction out all fluid

STEP 10 — Close the Abdomen (3 Layers)

🔑 Linea alba closure is the most important layer — if it opens = hernia or evisceration.

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🔭 SECTION 5: LAPAROSCOPIC SPAY (Minimally Invasive)

Type: Laparoscopic Ovariectomy (LapOE)

• Camera + instruments through 2–3 small ports (5–10 mm each)
• CO₂ insufflation of abdomen (pneumoperitoneum)
• Ovaries visualized on monitor
• Ovarian pedicle sealed and cut with energy device (LigaSure, Harmonic)
• Uterus left in place (no uterine disease risk if both ovaries removed)

• Less pain post-op
• Faster recovery
• Smaller incision
• Less intraoperative hemorrhage

• Special equipment needed
• Longer surgery time initially (learning curve)
• Cannot remove uterus (relevant if uterine disease later)

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🩺 SECTION 6: POST-OPERATIVE CARE (After Surgery)

6.1 Immediate Recovery (First 1–2 hours)

• Keep dog in warm, quiet recovery area
• Lateral recumbency until fully conscious
• Extubate when swallowing reflex returns
• Monitor every 15 minutes:
  • Heart rate
  • Respiratory rate
  • Mucous membrane color / CRT
  • Temperature (watch for hypothermia — use warm blankets, warm IV fluids)
  • Pain score
  • Consciousness level

⚠️ Hypothermia is the #1 anesthetic complication in recovery. Target temp > 37°C before discharge.

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6.2 Pain Management (Analgesia Protocol)

⚠️ Never give NSAIDs without food. Never give NSAIDs if kidneys compromised or patient is dehydrated.

• 0–5: Mild → NSAIDs sufficient
• 6–10: Moderate → Add opioid

• 10: Severe → IV opioid + reassess

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6.3 Wound Care (Incision Management)

• E-collar (Elizabethan collar) must be worn for 10–14 days at all times
• Check incision daily for:
  • Redness (normal mild redness = ok for first 2–3 days)
  • Swelling
  • Discharge (serosanguinous small amount = ok; pus = infection)
  • Wound dehiscence (opening)
  • Suture pulling or chewing
• No bathing for 10–14 days
• No swimming or running for 10–14 days
• Keep incision dry and clean

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6.4 Feeding and Hydration After Surgery

• Offer small, frequent meals for first 2–3 days
• Ensure dog is drinking water
• Watch for vomiting after eating (common day 1 — usually ok)

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6.5 Activity Restriction

⚠️ No jumping on/off furniture, running, playing with other dogs, or stairs for 10–14 days.

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6.6 Suture Removal

• Non-absorbable skin sutures: Remove at 10–14 days post-op
• Intradermal absorbable sutures: No removal needed

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6.7 When to Call Back / Emergency Signs

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⚠️ SECTION 7: INTRAOPERATIVE COMPLICATIONS

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⚠️ SECTION 8: POST-OPERATIVE COMPLICATIONS

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📊 SECTION 9: AGE FOR SPAYING — DEBATE & EVIDENCE

🔑 Key point: Mammary tumor risk reduction is the strongest argument for early spaying. For large breeds, balance orthopedic risk with mammary/reproductive health risk. Individual dog + owner discussion is essential.

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🏥 SECTION 10: BENEFITS OF SPAYING

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💊 SECTION 11: ANTIBIOTICS

Routine clean spays in healthy dogs have very low infection risk. Prophylactic antibiotics are recommended if surgery >90 minutes or contamination occurred.

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❓ SECTION 12: IMPORTANT Q&A (Frequently Asked Questions)

Yes, but it is higher risk due to engorged, friable blood vessels. Recommend waiting 2–3 months after heat ends. If must do it — use careful technique, have blood available, take longer time.

Yes — this is an elective pregnancy termination + OHE. Owner must give informed consent. Surgical bleeding is greater. Pups inside uterus will not survive.

The dog will show signs of estrus again (vulvar swelling, attracting males, behavioral changes). This is called Ovarian Remnant Syndrome. Needs re-exploration surgery. Diagnosis confirmed by elevated progesterone or vaginal cytology during signs of estrus.

This is Hormone-Responsive Urinary Incontinence (HRUI), also called Spay Incontinence. Caused by loss of estrogen → reduced urethral sphincter tone. Treatment: Phenylpropanolamine (PPA) 1–1.5 mg/kg BID, or Estriol (Incurin). Very common — affects ~5–20% of spayed female dogs, especially large breeds.

Yes. Ovariectomy is equally effective as OHE if the dog has a healthy uterus. The uterus without ovarian hormones will not develop disease. Laparoscopic spay usually uses this technique.

Not eating for 24 hours after anesthesia is normal. If not eating after 48 hours, check for pain, fever, or ileus. Offer bland food. If vomiting continues, give anti-emetics (maropitant/Cerenia 1 mg/kg SC).

Small seroma (fluid pocket) is common and resolves on its own in 1–2 weeks. True infection has: pus, bad smell, spreading redness, and fever. If unsure, recheck the dog.

Spayed dogs have a 20–30% reduction in energy needs (loss of sex hormones lowers metabolic rate). Start reducing food by 20% post-op. Monitor weight at every check. Switch to a neutered/spayed formula dog food if available.

Polyglactin 910 (Vicryl) 2-0 or 3-0 for ligatures. For linea alba closure: PDS (polydioxanone) 0 or 2-0 — it holds longer (absorbs in 180 days), which is important for body wall strength.

CPR protocol (RECOVER guidelines):

• Stop anesthetic gas immediately
• Start chest compressions: 100–120/min, 1/3 chest width depression
• Ventilate: 10 breaths/min
• Epinephrine: 0.01 mg/kg IV every 3–5 min
• Atropine: 0.04 mg/kg IV (for asystole/bradycardia)
• Vasopressin: 0.8 U/kg IV
• Reassess every 2 minutes

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📝 QUICK REFERENCE SUMMARY CARD

PRE-OP CHECKLIST:
✅ History + physical exam done
✅ Blood work reviewed (CBC, chem)
✅ ASA grade assigned
✅ Fasting confirmed (8-12 hrs adults)
✅ IV catheter placed
✅ Pre-med given
✅ Clipped and prepped aseptically

INTRA-OP CHECKLIST:
✅ Anesthesia maintained + monitored
✅ Both ovaries COMPLETELY removed
✅ Pedicles inspected for bleeding
✅ Uterine stump ligated x2
✅ Abdomen closed in 3 layers
✅ Instrument count complete

POST-OP CHECKLIST:
✅ Recovery monitored q15 min
✅ Temperature >37°C before discharge
✅ Pain score assessed + treated
✅ E-collar applied
✅ Owner discharge instructions given
✅ Follow-up appointment scheduled (Day 10-14)

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