DOn't know the answer to your question just commenting on your statement that a little over a year old is "a little late" I personally would NEVER neuter a dog before a year old so your doing good I think.
It is in the U.S.Chemical neutering isn't new
Oh, didn't realise that. I've known of it for 10+ years. Dunno if it's the same product though, probably not.It is in the U.S.. I know my neighbor in Japan had their cat chemically castrated (and he soon acted like a neutered male and his testicles shrunk so he looked neutered, too, so I think it was different than this product), and I was surprised when we moved to the U.S. and the vets hadn't even heard of it.