我找了一些相關網頁（每一篇都有獸醫或學術機構的研究佐證），關於 Early Spay/Neuter，找到的答案幾乎都是相似的，也就是早期結紮並不會有不良的副作用。節錄一些於下：
◎ http://exoticbengals.com/spay.htm
Years ago, when safe pediatric anesthetic techniques were not available,
waiting until a patient was older increased the safety of surgery.
Altering no longer needs to be delayed for this reason. These studies were conducted on
animals ranging from 7 weeks old to 12 months old. Those 7 weeks old did not react
any differently than those who were 12 months old.
譯：以往受限於麻醉技術，認為等長大再手術較安全，現在的研究發現，動物不論才七週齡或已十二個月大，反應都相同。
◎ http://cfainc.org/health/early-spay-neuter.html
..... early spay/neuter....has been practiced for over 25 years in North America. Early age altering refers to spays and neuters done between the age of 6 and 14 weeks.
譯：早期結紮/中性化指的是在六至十四週齡動手術，在北美地區已施行２５年以上。
....veterinarians may be unfamiliar with the surgical and anesthetic techniques required for pediatric patients.
....As well, concerns that early altering
could increase the incidence of feline lower urinary tract disease,
could affect skeletal development, and affect
behavior have been voiced.
譯：獸醫師可能對幼齡動物的手術與麻醉不熟悉.....怕增加貓的下泌尿道疾病，影響骨骼發育、行為....
A study recently published by researchers at the University of Florida
found no significant differences in the physical and behavioral
characteristics of cats altered at 7 weeks of age
compared to those altered at 7 months of age.
譯：University of Florida最近公佈的研究顯示，七週齡與七月齡的貓咪術後，在心理與行為上的變化，沒有明顯差異。
◎ http://www.canismajor.com/dog/earlysn.html
A study reported in Veterinary Medicine in August 1995 compared puppies sterilized at about eight weeks of age with littermates spayed or neutered at seven months and found that the younger puppies recovered more quickly ....
譯：Veterinary Medicine雜誌在1995年八月報導，八週齡與七月齡幼犬結紮，年輕的恢復較快
... female puppies.....incontinence .... no evidence that the problem is worse in bitches spayed at eight weeks than in those spayed later.
譯：並無証據顯示母犬早期結紮有比較高的尿失禁機會。
◎ http://www.king.igs.net/~brica/esp.htm
摘譯：網頁提出好幾個收容所的報告，早期結紮數百數千隻幼犬，都沒有不良後果。
◎ http://www.peteducation.com/repro/earlyspayneuters.htm
Some people were especially concerned that early neutering could make cats more prone to urinary tract disease. As more studies have been done, and followed, these concerns have been shown to be unfounded.
譯：以往擔心早期結紮早增加貓咪年老時得到下泌尿道症候群的機率，經長期追蹤，已證實不會。
◎ http://www.cvm.uiuc.edu/ceps/IVB/spay-neu.htm
The animal benefits because the anesthesia is fast and uneventful;
surgical procedure is well tolerated and animals recover faster.
譯：動物因麻醉快又安全而受益，手術時間縮短，恢復更快。
◎ 以下還有相關連結：
Neutering Male dogs - Whay it's a good idea?
Myths about Spaying and Neutering
從我們去年決定要養狗起，我才開始接觸和狗有關的資料。Early Spay/Neuter 似乎是在我所有看到的資料中，都是給予正面鼓勵的。我相信Shelter的原因很大，但是對於一般家庭寵物，早期結紮似乎也是好的。
