OP's dog's neurosis was likely caused by something else unless the tail was cut late into the puppy's life. I'm not advocating for cutting tails at all but I certainly don't have PTSD about my circumcision...
Or in my case, when you were non-consensually circumcised as an infant, experiencing grief/anger/etc upon truly understanding what that means.
For anyone reading, you can restore what was taken from you by applying tension to the foreskin remnant (“circumcision scar”) and slowly re-grow the lost tissue via mitosis. You can’t reclaim everything (frenulum, ridged band) but you can regrow the inner mucosa and outer foreskin.
The process is called foreskin restoration, and I encourage anyone who is interested to look into it.
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Elective surgery that removes functional sexual tissue: yes.
To make it clear, do you think it’s okay to cut off a newborn girl’s clitoral hood (the analog of the male foreskin)? I would hope not.
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My parents were raised catholic, but are atheists. So largely it was done for the usual pseudo-reasons: to “look like my father”, because it’s “healthier” (completely false), etc. I’m a white american so it’s a very common practice unfortunately.
The foreskin is not a vestigial organ. Violating the bodily and sexual autonomy of a child is never okay.