If other zombie animals exist they'd probably have all the same incpacities that human walkers have. Like being sluggish. Although there would a far bigger number issue, smaller creatures like rats could be hard to miss, bigger creatures like cows would be overwhelming by simple weight unless handled very quickly.
Only one difference I can see between Romero and TWD zombies with regards to animals. Romero zombies outright ignore other creatures like they're invisible. TWD walkers still chase animals for their meat. Fortunately, even if animals could turn, they all appear to be too far devoured before that can happen.
The EP4 scene where you dig up the dog was comical in a sense. If animals can't turn, then the only tension would've stemmed from being "ew gross". After 3 months the survivors were still unsure. The whatever infected everyone may not even be in the air/water/whatever anymore and the dog may very well have been buried before the ZA.
If Kirkman intentionally left the possibility of zombie animals ambiguous, he's left it far too late to confirm them now.
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