January 24, 2026, 7:26 am | Read time: 4 minutes

While we humans are emotionally swept away by sunlight, rising temperatures, and the return of life in nature, biological factors play a crucial role for dogs. Unlike us, who welcome spring with renewed energy, it becomes a hormonal roller coaster for our four-legged friends.

You may have noticed that your dog behaves differently during this time of year. Typical spring symptoms include more interest in other dogs, excessive marking behavior, restlessness and nervousness, as well as noticeable flirting behavior. The increased production of pheromones ensures that dogs perceive each other more intensely. 

Hormones on the Rise – Spring Chemistry in the Dog’s Body

As the days get longer, the production of certain hormones increases in many mammals, including dogs. The main players in this spring theater are melatonin, which regulates the sleep-wake cycle, testosterone, which particularly increases male dogs’ interest in females, and estrogens and progesterone, which regulate the heat cycle in female dogs. 

Can Dogs Really Be in Love? 

The idea that dogs experience romantic feelings like humans is tempting but not scientifically proven. What is certain, however, is that dogs can form strong social bonds. Especially intact dogs show increased interest in the opposite sex in spring—but for biological, not romantic reasons. Many owners report symptoms such as fixation on certain dogs, whining when separated, and even loss of appetite. 

Can Neutered Dogs Also Have Spring Fever? 

Neutered dogs also have hormones, albeit in smaller amounts. Environmental stimuli also play a role. The scent of a female in heat or the excited mood of other dogs can also affect neutered dogs. Instincts are not simply erased by neutering, so some dogs continue to respond to spring stimuli. 

Love at First Sight – or Just Instinct? 

You might know the situation: Your male dog spots a female in the distance, stands rooted to the spot, and suddenly seems completely out of control. He whines, pulls on the leash, and can’t be distracted. It might seem as if Cupid himself has struck him with an arrow. But what looks like deep infatuation is actually a mix of instinct and hormones. Dogs primarily react to smells and body language. A female in heat sends out signals that are irresistible to males. That’s why some dogs seem magically drawn to each other.

What to Do When Your Dog Is “Love Sick”? 

If your dog is particularly restless in spring, there are some tricks to bring him back to reality and manage his spring fever. More physical and mental activity helps burn off excess energy. Clear rules and distractions through training are also important. Some owners swear by pheromone products that can have a calming effect on the dog. If necessary, adjusted management with changed walking times can also help. 

Important Rules for “Love-Struck” Male Dogs Off-Leash 

Recall ability must be a priority, as hormonally charged male dogs are often harder to control. Other dog owners should be respected and asked for permission before your dog makes contact. It’s also important to observe the surroundings to recognize potential conflicts or unwanted behavior early. 

A good example was Bruno, a stately Labrador male who developed his own mind in spring. As soon as a female in heat was nearby, his hearing seemed to fail. His owner, therefore, kept him on a long leash and practiced targeted recall training to keep him under control in tricky situations. 

More on the topic

Expert Clarifies Do Dogs Really Suffer if They Don’t Have Sex?

Representative Survey Shows Castration Doesn’t Curb Aggression and Hunting Instincts in Dogs

Caution with a Female in Heat

Uncontrolled off-leash time can quickly lead to unwanted mating. Contact with males should not be underestimated, as they are often very persistent. Unprepared walks can also be problematic, so it’s better to choose quieter areas or times with less dog traffic. 

Especially important is not only recall but also good perimeter control—meaning the dog learns that on a cue like “Not so far,” it doesn’t increase its radius but stays close to its owners.   

Conclusion

Yes, dogs can have “spring fever” in a way—though not in the human sense. Hormonal fluctuations, longer days, and the general liveliness of spring affect their bodies and behavior. Whether it’s a flirting male or a restless female, spring can be a challenging but also amusing time for dog owners. 

It’s important to approach the topic with a wink and accompany your dog through this excited phase with a clear head and consideration for others. Then you’ll get through the hot phase together—until summer finally brings calm to the love chaos.