My cat did that for five times before we stopped taking it to the vets. I think she thought that if she did that would give a tuna fish because we'd feel sorry for her.

That unrepentant look on her face. I love it.

The other cat went merrrrrrrwwwowwww at him, forcing him to walk away slowly over the course of 10 minutes.

Most catfights involve a lot of hissing and spitting and no actual contact.

Not a vet, but I imagine it looks like a perfectly healthy cat moping around like it's about to die. I had a cat years ago that would get depressed anytime he would snap at my dog and then subsequently get snapped back at.

Maybe it was a online fight

Even rocky had a montage!

(lol I assumed you had linked the team America montage video, it’s even better that you used rocky)

This better be "Eye of the Tiger"...

Here is an alternative Piped link(s):

a training montage!

Piped is a privacy-respecting open-source alternative frontend to YouTube.

I'm open-source; check me out at GitHub.

Finally, a Rocky 4 montage and it's not Heart's on Fire!

When my neighbors cat enters the backyard my two cats suddenly turn into a crime fighting duo, even the dog gets in on the action, it’s all paws on deck against the intruder.

The rest of the time they’re all vying for control of their piece of the house.

If my mom's dog starts shit with the younger cat, the older one will lose his shit and attack the dog.

I think that depends on how they view the house as their territory

when we had a lot of cats and the occasional intruder cat, "duels" between one of ours and one intruder were most common. meet on neutral territory, hurl insults, maybe there's an attack but maybe not. and only after sufficient insults.

this was a specifically male behavior, too. we got a young female cat, and the 2 older males were horrified when she came and jumped their opponent. she was very no holds barred, get off my lawn, don't mess with my guys. a different time, a different young female cat was equally willing to jump in swinging claws and skip the insults.

typically the other male cats would be hanging around, observing and jumping in only if things moved from neutral ground to their territory.

When my roommate's dog chases my roommate's cat, my cat jumps in to defend him.

They do infact team up hell my cat army of 4 even protects their weaker friends I really don't know why my nabors cat continues to come into my lawn when he gets ganged up on by 3 of my 4 cats

We had two cats who wouldn't be in the same room as each other without hissing, but they teamed up to trap a neighbour's cat under my car one night.