Every March, the city of Valencia and surrounding areas erupt into one of the world's loudest celebrations: Las Fallas. Daytime firecrackers known as mascletàs, towering bonfires, and nightly fireworks displays that can exceed 120 decibels transform the region for an entire week. While tourists travel from around the globe to witness the spectacle, for countless dogs, cats, and other pets, the festival can trigger intense, prolonged anxiety that has real physiological consequences.
This is not a minor inconvenience. Animal shelters across Valencia report a sharp spike in lost dogs every year during Fallas week, as terrified animals bolt fences, break leads, or squeeze through gaps they would never attempt under normal circumstances. Veterinary clinics see a threefold increase in noise-anxiety consultations compared with other weeks of the year, according to data from Spain's General Council of Veterinary Colleges.
Why Are Fireworks So Distressing for Dogs?
A dog's hearing range extends from roughly 40 Hz to 65,000 Hz — far broader than the human range of 20 Hz to 20,000 Hz. Sounds that strike us as startlingly loud are, for them, physiologically overwhelming. More importantly, the unpredictable, sudden nature of fireworks explosions activates the hypothalamic-pituitary-adrenal axis, triggering a classic fight-or-flight cascade flooded with cortisol and adrenaline.
Behavioural signs of acute noise phobia include uncontrollable trembling, excessive panting, drooling, destructive behaviour, attempts to escape, hiding under furniture, incessant barking or howling, and involuntary urination. In severe cases, dogs have been known to injure themselves attempting to break through doors or windows. If your dog shows several of these symptoms intensely, this warrants veterinary attention — not simply waiting it out.
Prepare Before the Festivities Begin
Veterinary behaviourists consistently emphasise one principle above all others: start early. Ideally, preparation should begin two to three weeks before the peak of the celebrations around March 15–19. Practical steps include:
- Gradual sound desensitisation: Use dedicated playlists — such as those developed by Dogs Trust or iCalmPet — featuring recorded fireworks at progressively increasing volumes. Play them during meals or play sessions to build positive associations.
- Update identification: Verify that your dog's microchip details are current in the national registry and attach an ID tag with a working phone number to the collar before the festival begins.
- Create a safe haven: Designate an interior room away from windows and external walls. Add familiar blankets, a piece of your worn clothing, and a fresh water supply. Dogs instinctively seek enclosed spaces when frightened — support that instinct rather than fighting it.
- Adjust walk schedules: Walk your dog before the midday mascletà (usually around 2 p.m.) and before dusk. Minimise night-time outdoor time to essential toilet trips only.
Calming Tools Backed by Evidence
When the noise is already underway, several interventions have solid scientific support:
- Pressure wraps (Thundershirt): These garments apply gentle, constant pressure to the dog's torso, mimicking the calming effect of swaddling in human infants. Research published in the Journal of Veterinary Behavior found a reduction in anxiety signs in approximately 80% of dogs assessed.
- Synthetic pheromones (Adaptil/DAP): Plug-in diffusers releasing dog-appeasing pheromone analogues have demonstrated measurable reductions in fear-related behaviour in controlled trials. Activate them at least 48 hours before festivities begin to reach optimal concentration levels.
- Calming music: Slow-tempo compositions — Baroque classical music or purpose-composed canine relaxation tracks — can partially mask external noise and reduce autonomic nervous system arousal.
- Nutraceuticals: Supplements containing L-theanine, alpha-casozepine (marketed as Zylkène) or valerian extract carry moderate evidence of efficacy and can be started several days in advance without a prescription.
When to Involve Your Vet
If your dog has a documented history of severe noise phobia — self-injury, panic attacks lasting hours, or generalised sound sensitivity — pharmaceutical intervention is a legitimate and responsible choice. Spanish veterinarians can prescribe fast-acting anxiolytics such as imepitoin (Pexion) or intranasal dexmedetomidine (Sileo), both of which require a prescription. Long-term behaviour-modifying medications may also be worth discussing if the problem recurs annually.
One critical warning: never administer acepromazine or benzodiazepines without veterinary guidance. Acepromazine, in particular, sedates the animal without addressing the underlying fear, and evidence suggests it may worsen long-term sound sensitisation rather than improve it.
After the Festival: Assessment and Next Steps
Once the celebrations wind down, monitor your dog's return to baseline behaviour. If it takes more than 48–72 hours to normalise, or if new fears have emerged — sudden phobia of rain, traffic noise, or household sounds — book a consultation with a veterinary behaviourist. Noise phobia is a diagnosable and treatable condition. The earlier it is addressed with a comprehensive plan combining environmental management, behaviour modification, and when necessary pharmacology, the better the long-term prognosis for your pet.
Las Fallas is an extraordinary cultural tradition, designated Intangible Cultural Heritage of Humanity by UNESCO since 2016. With thoughtful preparation and the right professional support, you and your dog can both make it through the week — on very different terms, but without lasting harm.
