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If you're worried about your pet's health, please speak to a vet or qualified professional.

Neutering because of aggression from other dogs

81 replies

MyDuvetDay · 11/05/2026 12:56

Has anyone neutered a dog to prevent him being subject to aggression by other dogs?

Ive just had yet another incident where my dog (friendly) was saying “hello” to another dog while on our usual walk and the other dog suddenly flipped and went after mine snarling/biting aggressively. It was so terrifying for me and my dog, and his snout must have got scraped/grazed because there was a small amount of blood. The owner of the other dog was very defensive and basically said it happened because my dog is intact, as if her dog’s behaviour was justified on that basis.

this isn’t the first time I’ve heard this from other dog owners when their dog has snarled or had a go at mine. Mine was bitten by another male dog last year.

so while we weren’t planning to neuter our dog, I’m wondering if doing so would help protect him from this kind of aggression. Has anyone had a similar experience or have any advice?

OP posts:
Dunnocantthinkofone · 13/05/2026 10:59

TheHungryHungryLandsharks · 13/05/2026 10:04

@Dunnocantthinkofone They're much higher in the US v. UK. I think nearly twice as likely (something like 60-70% off the top of my head).

Dog genetics are a bit like human genetics in many ways - certain 'lines' are definitely more prone to particular issues including cancer. It's not a given, of course, but it's definitely a problem.

There are certain US lines that I (as a breeder) would absolutely never use any progeny from for any of my stud dogs, even though there's a tendency these days to try and important dogs for 'genetic diversification' reasons. I said upthread, that my family have bred Goldens for 50 years and none of ours have ever had cancer (and we don't spay once the girls have been bred from). That is possibly entirely coincidental and down to sheer dumb luck, but possibly not.

As with anything, I guess it's about the risks you're willing to take on each issue. I would never spay my girls as if they get hemangiosarcoma (which is more likely in a spayed girl) they're not going to survive as by the time you realise what's happened, it's too late. Pyo is horrible, but at least there are often signs to look for and you stand a chance.

It's a very personal decision. Lots of people prefer to spay as they worry about the risk of pregnancy for their dog. My advice has typically been to spay the bitch from litters I breed although I have never really advocated castrating boys.

I'm sorry for the loss of your boy. It's a horrible way to lose a dog 🌺

Thank you. I’d personally never neuter a boy again unless for individual medical reasons as I can’t see a clear benefit and medical opinion seems much less mixed but as you say, it’s a very personal choice . I lost mine to osteosarcoma, which wasn’t studied in this paper specifically but as you say, was bloody awful.
New girl (11 months now) will have 2 seasons for sure, then I’ll assess based on how she copes hormonally and how easy managing a high drive working lines dog in season in a very suburban area becomes! Not because of my ability to manage her, but because other people don’t have control over their dogs which rules out all off lead opportunities for her safety- unless I can find a hire field which allows girls in season!

Wolfiefan · 13/05/2026 11:12

Thankfully we have lots of safe spaces near us where in season bitches are allowed. I wouldn’t risk an in season girl off lead around any other dogs. It’s not about training but instinct. Both of mine are in season and one was driving the other a bit nuts the other day!

Dunnocantthinkofone · 13/05/2026 11:15

Wolfiefan · 13/05/2026 11:12

Thankfully we have lots of safe spaces near us where in season bitches are allowed. I wouldn’t risk an in season girl off lead around any other dogs. It’s not about training but instinct. Both of mine are in season and one was driving the other a bit nuts the other day!

You misunderstand me (I worded it badly)
I don’t have anywhere I could take her where I could have enough space to ensure we were far away from other dogs
Not a bloody chance I’d have her off lead around others - or even on lead where we might come across those off lead

And restriction to on lead road walks and my small garden for 3+ weeks at a time may prove impractical

Wolfiefan · 13/05/2026 11:51

We are so lucky with our secure fields. I have access to an awesome one. Fenced well and nearly 10 acres. It’s not a cheap way to exercise them but on lead for weeks isn’t fun and my garden is tiny!!

Talkinrubbishagain · 13/05/2026 12:59

Try an implant ‘Suprelorin’ which mimics castration and lasts for 6 months (12month also available). It will enable you to see how castration affects him and the behaviour of other dogs towards him. I suspect it’s your dog’s attitude that is drawing the aggression to him. It’s worth getting a behaviourist in to advise.
Castration can adversely affect a dog so it’s definitely worth a test run.

Dunnocantthinkofone · 13/05/2026 13:17

Speaking as said behaviourist this is my take on chemical implants

The implant (Suprelorin) is reversible physically, but it can temporarily change a dog’s hormones and behaviour enough that they learn new aggressive habits, and those habits can stick even after the drug wears off.

No drug is without potential side effects and I have seen first hand more than one dog become permanently reactive due to the testosterone surge that is initially experienced with this drug. Some vets now recommend a second jab to blunt that surge alongside Suprelorin
In short, use with caution, do your research and if possible ask your vet about the second jab. Careful management during the period of hormonal flux is highly recommended to reduce the chance of issues

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