Can you use fish penicillin for your dog?

No. Antibiotics actually cause yeast infections. In addition to destroying the bad bacteria that makes a dog (or person) sick, antibiotics also destroy the good bacteria that the body needs to stay healthy. Also, antibiotics only work on bacteria, and a yeast infection is caused by a fungus. So what your dog needs is an anti-fungal medicine, which you can get from your vet. An antibiotic will be absolutely useless on a yeast infection, and will only make it worse. When taking antibiotics, you can give your dog yogurt, but not Frozen Yogurt, because it has no active cultures (acidophilus). You can also give your dog acidophilus pills while its on antibiotics to prevent yeast infections, but check with your vet for the amount to give your dog. The tablets are available at any drug store, and you don't need a prescription. These same measures also apply to people.