Introducing male puppy to male dog

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We have a 3yr old greyhound crossbreed (he's the same size as one but as broad as a collie), he's neutered and generally loves all dogs and people. Had him since 8 weeks.

We want to introduce a male chihuahua puppy (8-10 weeks).

We introduced him to a female collie pup after being told it's better to mix genders so they don't fight for the "alpha" status.... She was total boss and constantly fought him to be 'top dog' even though he wasn't that bothered. So I don't think gender is going to matter too much anymore.

Any tips on introduction? My fella is crate trained so gonna give them both separate spaces if they need distance

Neutral territory - a park maybe.

Three of my four dogs are male and I've never had an issue just bringing a puppy home and introducing them there.

It's normal for puppies to be complete shits to adult dogs. It's got nothing to do with wanting to be "alpha" or "top dog" (dominance and pack theory has been soundly debunked, have a read of this), it's just them being overenthusiastic youngsters with zero manners.

Expect to do lots of separating at first to give your older dog a break from the puppy if it's pestering him.

As an aside, good chihuahua breeders generally keep their puppies until they're older (the breed club code of ethics requires 12 weeks) as they generally wean and develop a bit later than larger breeds.

Thanks that was really helpful, and useful to know what I'd been told about alphas is a load of rubbish now I can work in the right direction :) My dog would play all hours of the day and has skin of steel so I don't think he would be bothered by the pup, he definitely wasn't last time he spent time with one but that's his downfall really because he never lets them know when they've gone too far (very dopey dog lol)

Both my male dogs ( age 3-4 ish ) adore puppies and will put up with a lot of play and silliness, though they will let the pup know when enough is enough.
My two girl ddogs, now aged 9 are much quicker to tell off a pup and seem to do it in a way that pups listen and learn very quickly not to push it.
It's nothing at all with any of them trying to be top dog, just the way they naturally learn to live peacefully together.