Not as dramatic, but we've also had an issue introducing our new pup to our older dog. Our older dog is already neutered, he's a lab mix, so not an aggressive breed, he's just always been a very assertive dog. He got the new pup on her ear and tore a nice chunk out of it......
We spent the next few months playing the doggie shuffle--one dog in, one dog out. Roscoe just had to be in the outdoor kennel more, or in my bedroom. It was pretty stressful, and that was with just one pup to watch out for!
If you go through another puppy introduction in the future discover x-pens! They are perfect for separating puppies from adult dogs and everyone can share the same "family time" in the same room. Less confining than a crate the dogs are together but safely separated (not a good idea for large dogs that want to kill each other, but for separating puppies they are ideal).
I live in a VERY small house and had an unexpected litter a while ago (pregnant little stray showed up desperate and then had 5 pups two days later). I had no space and male house dogs that wanted NOTHING to do with obnoxious puppies so we set up an x-pen for mom and the pups in the main living area. Puppies were birthed and raised in their little pen, adult dogs carried on in the house as usual. Everyone could enjoy the same family time, bones, socialization etc.... They were "separate but equal". No one was isolated most especially the older adult dogs. When the pups were old enough to spend time outside I fenced a small little yard pen for daytime use, they stayed in their little area and the adults had the rest of the yard as usual.
I think the pups were about 5 months old before I started letting them have some supervised time with the adult males, the pups were old enough to have some manners and use common sense.
Here is an example:
To the op:
I am glad you got the two pups to the vet and did the right thing. I nearly suggested if you can't take them to the vet then man up and take them in the back woods (individually) with a .45 to stop their suffering. Don't blame your adult males, chances are they will love the female pups once the girls hit puberty. If you decide to keep a male pup that could be risky and you might want to neuter the pup very young.
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