FERAL
By their very nature zombies are feral creatures who want nothing in the world other than to bite things. It is not zombies we are concerned with in this segment, though, as unfortunately they will not be our only threat during the apocalypse. Other feral creatures can also cause us problems. Let’s take a look at them.
Wild animals – feral
Rats, badgers and mountain lions will all become more widespread when they realise civilisation has ceased. They will be more prevalent in urban areas and less afraid of humans.
Domestic animals – feral
Left to fend for themselves they will revert to the ways of the wild to survive. Danger level depends on the animal. Dogs will be more dangerous than budgies.

Children – feral
Depending on the time they have been alone they will become more and more animal-like – much like Tarzan or Mowgli. Highly unlikely to attack. Hiding and stealth will be their modus operandi, and stealing supplies will be the main issue you have with them.
Adults – feral
The most dangerous of the lot – as becoming feral will have more to do with mental issues than necessity for survival like the other examples. They will attack you, they will try to kill you and they will smell.
Colin – feral
I think this one’s a typo but I believe he can be a bit of a rough diamond. You certainly wouldn’t want to rub him up the wrong way. Not sure if he’d attack you – maybe if you were taking pictures?