Check the label...it depends on the concentration of the solution you are using...
That depends on the strength (i.e., how many mg/ml ?) of the medication.
Yes
i don't recommend it.
You can give any size dog penicillin. It would need 3 mL or 3 cc's.
Penicillin is not always the best drug to give to a horse, you should consult with your equine veterinarian to get an exact idea of what medicine should be used for the ear infection.
Subcutaneously means uinder the skin.
You should not give a horse oral Penicillin. Oral Penicillin can seriously disrupt normal microorganisms in the digestive tract which can cause diarrhea and abdominal pain (colic). For an abscessed tooth you may need to give Injectable Penicillin, but never oral. It would be best to contact a equine veterinarian and possibly an equine dentist, as the tooth may need to be removed.
Penicillin needs to be injected intramuscular so the breast works really good or divide the dose into two and do one shot in each leg up in the muscle
You should not give horses Penicillin for a cold, as a cold is caused by a virus and Penicillin is an Antibiotic and is not designed to treat a cold. You must let the cold run it's course, just like in a human.
The amount of penicillin and the length of time to give it will vary somewhat with the brand used. It would be best to consult with a equine veterinarian regarding dosage and length of use.
First you should have a farrier and veterinarian come out and inspect the hoof for deeper infection. Once this has been done the equine vet will be able to give you exact dosage and time limits on the penicillin.
That's not a good idea. The injectable penicillin is meant to either go into the muscle (IM) or the vein (IV) depending on which type your vet gave you. The amount and strength will not be appropriate to give orally.
From a vet. If pennicillin gets directly into a horse's bloodstream, even a small amount will send them into anyphalactic shock and kill them without IMMEDIATE vetetrinary intervention. Do not attempt to give pennicillin yourself.