No, IT IS NOT. This was NOT Rx'd by your vet, because the ASPCA Animal Poison Control has been consulted over 70 times on dogs or cats overdosing or getting exposed to it, through the ingestion of an ointment either applied inappropriately to them, or ingesting part of a tube, meant for human use. The degree of toxicity or illness from ingestion - which can affect the central nervous system or the heart, depends on how much was ingested and the size of the dog.
http://aspcapro.org/sites/pro/files/toxbrief_0900.pdf
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You are an IDIOT to self-treat an injured dog. With-holding vet care to a sick or injured animal is considered a FELONY case of ANIMAL ABUSE, regardless of your ability to PAY FOR IT. Take it to a vet for correct safe treatment or turn the dog into the Humane Society or ASPCA for treatment. The dog may need stitches and will certainly need ANTIBIOTICS