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Many vets that have been in practice a long time have this belief... but it appears to be unfounded. Here's a quote from "Determining the optimal age for gonadectomy of dogs and cats" (JAVMA, Vol 231, No. 11, December 1, 2007 - https://www.avma.org/News/Journals/Collections/Documents/javma_231_11_1665.pdf):I worked for a vet once and she hated it when cats were fixed too early and said this caused many problems. I remember she said the males didn't get to fully develop and it caused issues for them
"Despite numerous vehemently declared anecdotes of an increase in the incidence of urethral obstruction in male cats castrated when young, numerous studies have failed to detect a correlation between gonadectomy of cats at any age and a decrease in diameter of the urethra or an increase in incidence of FLUTD, with or without urethral obstruction."