[Pseudoscience-is-malarkey (OP)]

Only in the cartoons they're not?

[alancalverd]

They are as variable as humans in their tolerance of one another.

Most will adapt to living in the same house but with slightly different attitudes: dogs seem to regard it (and the human residents) as a domain to be secured and protected against all intruders, whilst cats treat it as a residential club with room service and only object to feline non-members entering the premises. Dogs quickly learn to pee and poo outside, whilst cats tend to demand (or nominate) ensuite facilities.

Order is quickly established in my experience. "I could swallow you in one mouthful" "Not if I scratch your eyes out first".  "I eat from the big bowl, with a few vegetables" "I only eat meat, from the small bowl".

[Zer0]

Y'all remember Spike from T&J?

lool