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：
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.
..... 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.
....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.
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。
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 ....
... female puppies.....incontinence .... no evidence that the problem is worse in bitches spayed at eight weeks than in those spayed later.
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.
The animal benefits because the anesthesia is fast and uneventful;
surgical procedure is well tolerated and animals recover faster.
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。