Hello, and thank you for your question. Your situation is certainly unique and I am grateful you are looking for the information you need to try to do the best you can for these puppies.
You are correct that there is a shot that is used to chemically sterilize dogs, and it has been used successfully. It's called Zeuterin, and you can read more about it here:
Unfortunately, this product is not going to be helpful in your situation for several reasons:
- It is only capable of sterilizing MALE dogs, not females
- It has to be injected into each testicle, which requires some degree of sedation/anesthesia
- It can only be sold for use by licensed veterinarians
- There is a learning curve and specialized training is required for proper administration without which it is not likely to work.
- It is struggling/failing on the commercial market and is generally not available any longer
So, unfortunately, while you may have heard of a way to sterilize a dog with an injection, the product will not be available to you or helpful in your situation.
The only way to sterilize these puppies is with a traditional surgical spay, I'm afraid. I wish there was a different option, but there is not.
So sorry I don't have better news for you.
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