Skip to main content

How long after neutering a dog does behavior change? These are the differences you might see

Neutering can bring a few changes, but don't believe these myths about the procedure

We’ve all heard Bob Barker’s famous advice to fix our pets and help reduce the population of unwanted cats and dogs. It’s a good message to follow, but that doesn’t mean you won’t see any side effects or that the surgeries carry no risks.

After all, any time a human or pet goes under anesthesia, there’s a small risk of serious complications; not to mention other possibilities, like an infection at the site. But what about other unwanted changes, like to your precious pup’s personality? We’ll walk you through what to expect when you get your dog neutered.

Dog runs through the lawn with a ball
Image used with permission by copyright holder

What changes to behavior might occur after a dog is neutered?

Keeping a dog intact can cause a number of unwanted behaviors, including humping, marking, and wandering to find a mate. These should go down or even cease after the operation. You also may notice a decrease in some aggressive or anxious behaviors, especially if they are caused or exacerbated by the presence of a female in heat. On the other hand, certain types of aggression can increase in specific dogs, most prominently those neutered at a very young age, and you should discuss your unique animal with your vet before the procedure.

How long after neutering does dog behavior change?

In the days following his neutering, you could see a few common symptoms, such as lethargy and perhaps a little pain. Follow your care instructions to the letter to avoid complications and much of the strange behavior after neutering your dog will resolve as he heals. Some behaviors, like marking, could stop as soon as you bring your pup home, but it will take up to eight weeks for all the testosterone to leave his system.

Over the course of these two months, you should expect a few small changes; however, most owners don’t see big differences outside of changes to these typical pre-op traits, like excessive humping. One word of caution: Don’t go into neutering expecting a 180 on his mannerisms. Stick with consistent, positive reinforcement training to work through any issues.

Dog with a vet

Don’t believe these myths about neutering

It will change his personality

While some minor shifts should be expected, you won’t see any big changes in personality after the operation. Many temporary changes will go away as soon as he recovers from surgery, and hopefully, you’ll find the exact same pup after.

He’ll become overweight

After undergoing the procedure, your pet’s metabolism could change, but that just means you should adjust his calorie intake or exercise regimen. Once you find that balance, your pet won’t have any adverse effects.

His risk of cancer will increase

There are no two ways about it — the data here is complicated. Some cancers absolutely decrease, like testicular tumors, while others may increase. It comes down to many factors, including breed and age, when neutered.

While there are pros and cons to “fixing” your dog, it’s important to keep the population of unwanted puppies down. If it turns out this particular operation isn’t right for your pet at this moment, you can look into others, such as a dog vasectomy or delaying neutering and keeping him from other canines until he’s ready. Always work with your vet to determine which path is right for you and your pup.

Editors' Recommendations

Rebekkah Adams
Rebekkah’s been a writer and editor for more than 10 years, both in print and digital. In addition to writing about pets…
Can dogs eat shrimp? The answer may surprise you
How to cook, cut, and prepare shrimp for dogs
A French bulldog puppy wearing a yellow sweater stands next to a dog bowl in front of a blue background

When dog owners are in the kitchen, it's only normal to have an extra pair of eyes watching their every move. Furry friends are never far away when food is around, and it's all too easy to toss your dog a table scrap their way when they look up with those pleading eyes. How could you say no?
Unless a dog is dealing with dietary restrictions or medical issues, the occasional bite of people food won't hurt. Of course, it's important to make sure that whatever you're feeding them is safe for canine consumption, as so many dog owners go to the internet to double-check. That's why you're here!
If you've been wondering, "Can dogs eat shrimp?" -- you've come to the right place. We'll break down everything you need to know about feeding dogs shrimp so you can get back to cooking.

Can dogs eat shrimp?

Read more
Does your dog drink a lot of water? Here’s when you should be concerned
It's usually just the weather, but you should look for signs of dehydration or excess thirst
A pug drinking water from a sink faucet

Ensuring your furry best friend gets plenty of water is one of the most important parts of being a pet parent. But how much water should your dog drink on a daily basis? Veterinarians claim the general rule of thumb is a simple equation: The majority of dogs require around 1/2 to 1 ounce (about 1/8 of a cup) of water per pound of body weight each day. Don't want to reach for your measuring cup? Make sure your pup has round-the-clock access to clean water, and everything should be fine.

That being said, if your dog empties their water bowl several times a day, or you notice their intake has increased drastically, you should probably keep a close eye on things. If your dog drinks a lot of water, you may be wondering, "Why is my dog always thirsty?" We'll share how to monitor your pup's water intake, the most common reasons your dog may be thirsty, and when you should speak with your vet.

Read more
Can dogs eat mango? Read this first
Find out if this tropical fruit is safe for your pup
A dog in the kitchen looking up at woman drinking coffee

As humans, we love to share with our dogs. Perhaps your pet snuggles up to you in bed, sharing — or stealing — your blankets. Sharing experiences, like holiday activities, can also be a fun way to bond.

Food can get dicier, though. Some human-favorite items, like chocolate, are toxic for dogs. Others make fine (and even healthy) treats. If mango is your favorite fruit, you might want to slip your pet some. Also, your dog might always be around the fruit and sneak some off your plate. Can dogs eat mango safely? Generally, the answer to this question is yes, but there are some caveats. Also, correctly serving a mango is critical. Before throwing your dog a piece of this sweet fruit, here's what to know.

Read more