And not to make this thread that I’ve already started referring to as the Perryshmirtz Bible even longer considering how long it already is, but I’d just like to say that even if this relationship isn’t your cup of tea (which is totally fine, like what you like, dislike what you don’t), I just want you to please note that every single argument I’ve seen against the ship’s validity is completely fallible considering all the above points from canon and the fact that the show itself goes heavy-handed on the metaphor from It’s About Time! forward. There’s a pretty clear metaphorical multi-season arc about cheating and fixing the collateral damage that caused for both parties from that episode up to Lost in Danville, using both symbolism and allegorical text to make that point (Perry walking in on Peter and Doof fighting, there’s a paw mark on Doof’s cheek - you can already guess what that’s supposed to mean, hiding Peter away in the closet, the whole song afterwards where Perry sadly accepts being replaced, literally going on what looked like Dr. Phil to fix the relationship, and then when you look at Lost in Danville - Doof telling Professor Mystery he would “never want to be the other evil scientist” AKA the other man, Doof calling Peter his “thwarty call” [really? that flew right under Disney’s radar? LMAO], “what could he give you that I couldn’t give you?” and that whole scene where I was wondering whether or not I should even be there because that got way too personal, etc. Cartoons are no stranger to metaphors). So yeah, it’s completely supported as a metaphor already in canon, and even outside of that, it’s often been supported in other canon works and merchandise, and even been supported by Dan and Swampy themselves as a valid ship.
And after all, why shouldn’t it be in a world where one of Doof’s exes left him for a whale, a man can be in love with a milk carton and have milk carton kids, a teacher can be in love with a desk, and a kid can be in love with an ice cream machine? Not to mention as well, Marty the Rabbit Boy and his musical blender exists which also implies the likelihood of him having at least one human and one rabbit parent (for all I know, this could be the son of Jessica and Roger Rabbit LMAO). It’s also worth mentioning that in this universe, Major Monogram had to take a class on animal sensitivity for treating his animal agents as lesser species where he had to write on the chalkboard over and over that “animals are people, too”. But hey, while we’re on the topic, back to the Jessica and Roger Rabbit thing because I see us using that comparison a lot - and there really is no difference. “But Perry can’t talk” neither can people who are mute. Even besides that, he did at least once in Night of the Living Pharmacists where he was turned into one of the Doof-zombie animal hybrids like the other agents, and he was the only animal agent who did say “lots of me” in clear English whereas the others kept to their regular animal noises, which sort of implies that Perry could probably speak at least some English, but rather chooses not to, much like how Ferb most of the time chooses not to speak. “But the toons know that they’re toons; this is reality for PNF characters” not necessarily - there’s been jokes and moments in the past that regularly break the fourth wall, implying that they either know or at least have some knowledge of the idea that they’re living in a cartoon show world. And even still, that doesn’t matter so much when you take into account the rest of the rules of this particular universe. And dare I say it, the Who Framed Roger Rabbit? universe was just as crazy in collaboration with the real world (a universe that also similarly used cheating metaphors like catching Jessica playing patty-cake with another man - though the metaphors there were even more on the nose), and if memory serves, even the cartoon baby was literally like a 40 year old man who was regularly getting bitches, lmao. I’ll bet you anything that Dan and Swampy sat down to watch that movie one day, were told they couldn’t make anything crazier, said “hold my beer”, and that’s how we ended up with Dwampyverse in the gloriously weird way that it’s been presented.
I get it looks weird from an outsider’s viewpoint, too. I was you a few weeks ago before my rewatch, because I hadn’t seen the show since I was 6 or 7 and forgot that all of these things even happened, but it’s pretty blatant when you watch the show especially as an adult. That metaphor is almost impossible to miss. Even I was surprised that Disney let all of that stuff slide the way they did, but because it can be somewhat passed as humorous because one character is a platypus and the other is human presenting (ocelot adoption aside), that’s probably why they let the metaphor run its course more openly than, say.. shutting down Buford and Baljeet’s queercoding with bromance and “he’s like my least favorite brother” because they’re two human boys and Disney just can’t give the LGBTQ+ crowd anything.
But anyway. It’s fine if you’re not interested in or don’t like Perryshmirtz - I wouldn’t force anyone to ship it, or to ship anything in general. If you don’t like it, you don’t like it, end of story. But where I do stop you is when you’re making arguments against its in-universe validity, because by validity standards alone, the rules of the PNF universe checks out. Comparing a cartoon universe to our own only works so far when cartoons regularly bend the rules of our reality to the furthest point it can. I mean honestly, if half the contraptions that Phineas and Ferb build in one single day could A) actually be built that fast and B) could work flawlessly the way they do without extended time for testing and research needed, we could’ve solved so many problems in the world already. And that’s just cartoon universe basics, that’s not even getting into the logistics of how much these things would cost in our world or even cartoon physics. But regardless, if it’s valid by the cartoon universe’s standards before the court, then it’s a valid relationship in that universe.