Common antibiotics prescribed to pets include amoxicillin, cephalexin, and enrofloxacin. Amoxicillin is a broad-spectrum antibiotic that works by weakening bacterial cell walls, causing them to burst. Cephalexin, also a broad-spectrum antibiotic, disrupts cell wall synthesis, preventing bacteria from reproducing. Enrofloxacin is a fluoroquinolone antibiotic that interferes with bacterial DNA replication, halting growth. Potential side effects vary: amoxicillin may cause gastrointestinal upset, cephalexin can lead to vomiting or diarrhea, and enrofloxacin might result in joint issues in young animals. Always consult a veterinarian for specific guidance and monitoring during antibiotic treatment.