Animal-welfare agencies and veterinarians across the United States are warning that Independence Day fireworks routinely trigger a surge in lost pets and emergency room visits, and are urging owners to take preventive measures ahead of tonight’s displays. San Jose Animal Care and Services expects the number of strays entering its shelter to jump about 30% over the holiday weekend, after fielding more than 700 animals during last year’s celebrations. Shelter Animals Count, which tracks nationwide intake data, says the days immediately following 4 July bring the year’s sharpest rise in stray dog admissions. Emergency providers are also bracing for the fallout. Portland’s DoveLewis Animal Hospital reports a yearly spike in cases tied to noise anxiety, heat and accidental ingestion of picnic food, according to emergency veterinarian Dr. Sarah Tauber. The Nevada SPCA, which calls 5 July one of the busiest days on its calendar, is offering $5 microchip appointments to speed reunions. Officials recommend keeping pets indoors in a quiet, secure room, masking outside noise with music or television and ensuring collars, ID tags and microchips are up to date. Veterinarians advise anxious owners to consult about calming medication or weighted vests. In Los Angeles, where consumer fireworks are illegal, the Department of Animal Services is asking residents to report illegal displays and to register pets on a photo-matching database to help locate runaways.