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Q: How long after neutering is a male dog still capable of breeding?

February 7, 2009 | By emily c. | 9 answers | Expired: 2130 days ago

emily c.

I know it sounds like a stupid question, but it's a major concern! We are watching a friend's dog, who was just neutered. Our female seemed to go into heat right away (she's been shedding like crazy and her fluffy tail is down to just a twig). But I have yet to see a single spot of blood from her (her last owner said she was not very clean for her first heat)...so I'm not even sure she's in season. It's been a week and she's still not spotting and I'm beginning to get worried. I've heard from two vets that my friend's dog cannot breed and from one that we should have kept him away thirty days. Help!

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Rachel P.
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Feb 08, 2009

There are several components to this answer :)!

Neutering is a surgical procedure that removes the testicles. The testicles are the production and storage place for sperm as well as the primary tissue of origin for testosterone. Removing the testicles essentially removes 99% of the sperm from the body. In theory there can be some sperm still in the spermatic cord and prostate -- this is NOT considered of sufficient quantity to impregnate but one thing I have learned is that you never say never w/Mother Nature. Given the average lifespan of a sperm outside the supportive tissue of the testicle is at most 2 weeks (average 7-9 days) then in theory he is fertile for at most 2 weeks after neutering

Testosterone has a longer lifespan and it slowly drops over a 30-60 day period. Mounting for sexual reasons (do note mounting also occurs for other reasons) is both a hormonally driven behavior as well as a learned behavior. This means that the amount of testosterone needed for the dog to mount for sexual reasons varies TREMENDOUSLY between individual dogs. I personally had a foster (Charlie) who was older (est 8-10) when he was rescued and from all reports was the "main man" on the "street" prior to capture - meaning he bred countless times. I neutered him soon after getting him and TWO YEARS LATER he still managed to "breed" (mount and penetrate) one of my personal dog. Now IMO this is the extreme end of the spectrum but the point here is that the desire to mount for sexual reasons while influenced by testosterone can occur in the absence of testosterone especially in older, "experienced" males.

BUT even if the neutered dog manages to mount and penetrate the bitch since there are no viable sperm no fertilzation can occur. So while some people would consider or call what he did "breeding" it does not result in offspring.

So back to the question at hand -- just to be safe I would keep him away from the bitch in heat for at least two weeks. He needs to be kept still and not stress that area ANYWAY during this time because of the recent surgical trauma to this area. After that will depend entirely on him whether or not he can be around bitches in heat or not without trying to mount them. After two weeks, assuming all testicular tissue was removed, he is infertile.


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Ethel02
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Feb 07, 2009

I think your friends Vet is correct, I know it has to be awhile just not sure how long in the meantime bring your dog to the Vet & find out if she is pregnant, the sperm is still alive for awhile.

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Sandra  F.
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Feb 07, 2009

The best answer is to contact your vet. They can let you know what is best. But, hopefully no damage was done.

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Heatherzopff
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Feb 07, 2009

i am a vet tech and all my vets have always told people that a male can impregnant for up to 2 weeks after surgery. to be safe keep him away. also since he was just neutered you dont want him mounting any females because this can hurt him and cause infection if he rips his incision. and the female is probably in heat, especially if hes showing interest. females usually dont start to bleed untill the 2nd or 3rd week and then when they stop bleeding theyre still in for about another week or two.

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L.H.S.
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Feb 07, 2009

I agree with the last response that if the neuter was don ee correctly, they can still breed and have the desire for
awhile after until the hormones are gone but there should be no pups from it.

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Tom B.
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Feb 07, 2009

As long as the neutering was done correctly, its not possible for him to reproduce. He will still have the drive for up to a month so he might try but will not succeed

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Anonymous
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Anonymous

Feb 07, 2009

They cannot reproduce after being neutered, but the dog may still have hormones in the bloodstream that will give him the urge to try for awhile. This should be prevented right after surgery so as to allow the dog to heal without tearing anything open.

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Melissa S.
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Feb 07, 2009

I'm pretty sure that is not possible.

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Pai's Mom
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Feb 07, 2009

The one vet that has said to keep them seperated for 30 days possibly is because even though he's neutered he could still be come aroused and could try to tie... perform acts of mating if your female is in fact in heat.This could cuase injuries if you are not around to seperate them.A neutered male usually won't try this if the female is not in heat. But no he should not be able to breed.Hope this helps

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