Haha, that goat thing is pretty cool. If you're still looking for ideas though...
Something like the warrior bugs from Starship Troopers? Lobotomized nids?
If you're concerned about scales and whatnot on lizards, why not dress them up in barding or caparisons? As a tangentially related example, I'll post some of my crappy old artwork, albeit more feathers than scales, and still leaning towards the AHMAHGAWD DYNOZAWRS that you're trying to avoid:
Except more covered maybe.
Other ideas in descending order of seriousness:
Great apes? Probably too tall.
Giant scarabs or rhinoceros beatles?
Giant kangaroo rats?
Wombats/Capybaras
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Pogo sticks.
Hippity Hops.