yes it does.
same as it allows even a 1px cast bar
edit Unitframes.lua.
Ctrl +F Height and edit Minimum from 10 to 1
back into wow /ec and set any height you like :-) same with maximum you can change the minimum / maximum values. tried and tested :-)
the line in question to duplicate that specific frame would be 3258. the code starts like this as default
width = {
order = 2,
name = L['Width'],
type = 'range',
min = 10, max = 500, step = 1,
just change the last line to
min = 1, max = 500, step = 1,
and you can have the pet frame starting from 1px :-)