The main reason is to desex before the first heat period to
1/ 避免懷孕 Avoid pregnancy
2/ 避免發情期引起的問題 ，例如逃走/打交/感染性病 Avoid on-heat/mating caused issues e.g. escape/fight/TVT
3/ 避免90% Avoid 90% hormone-related disease
為什麼是5個月大？Why 5 months old？
1/ 陰部有淺紅色分泌流出，維持一星期左右。狗公會被氣味吸引而來，但狗女沒有興趣交配 Light color blood discharge from the vulva. Last for about 1 week. Male dogs are attracted by the chemical substances from the female. However, the female is not interested to mate at this stage.
2/ 狗女陰部開始腫漲， 仍有分泌，會站立願意交配，維持一星期左右。
The vulva softens and swollen. Discharge continues. Stand up and ready to mate. Last about 1 week as well.
1/ 頭一兩天，貓女陰部腫漲，食量增加，十分活躍，發出短低叫聲，比平常嬌嗲。貓公會被氣味吸引而來，但貓女沒有興趣交配。The first stage lasting about 1-2 days. Vulva enlarged slightly. Increase of appetite and restlessness, utter short low calls and more affectionate. Male cats are attracted but the female is not ready to mate.
2/ 貓女準備交配，會發出更大和頻密慘叫聲，維持4-6日。 Louder and more frequently meows, even sound like in pain. Female cat ready for mating. Last about 4-7 days.
點知道貓狗正發情？維持多久？How to tell if the cat/dog is in heat cycle? How long does it last?
狗 Dog : 2 次 times
貓 Cat ： 3-4 次 times
一年發情幾多次？ How many heat cycle in a year?
狗 Dog ： 大概56-58天 about 56-58 days
貓 Cats : 大概63天 about 63 days
懷孕期幾多天才生產？How long is the pregnancy?
發情/懷孕可絕育嗎？ If animals are in heat cycle or pregnancy, can it be neutered?
貓貓-5-6星期，狗狗 – 6-8星期。請預早排期。
5-6 weeks for cats. 6-8 weeks for dogs. Please arrange in advance to avoid delay.
生產完後何時可以絕育？How many weeks should the female cats/dogs be desexed after whelping?
請留意耳尖是否剪平或剪成 V 字，這是絕育記認.
Check if ear-clipped marking either in a straight line or V sharp. That is a virtual marking for desexed animals.
Ask the keepers/feeders directly.
Keep an eye on the animal if it has heat-cycle or got pregnant in a year's time.