Does anyone know if antibiotics are species specific? Or are antibiotics such as amoxicillin all the same regardless of whether they are prescribed for dogs, cats, reptiles, humans, fish, etc.? I know amoxicillin for dogs can also be used for cats if you adjust the dosage for body weight and ailment. But there was a time that I lost a couple tablets that I was supposed to give to my cat and I wasn't sure if I could give her one of mine since we were both taking 500mg amoxicillin. Kind of a weird question, but just curious.