What counts towards your pet limit?

[Frank McGovern]

Breaking this out from the pet cost post.

For those of you that do pet limits, what does it apply to? If you have a two-pet limit, can someone do 2 dogs and a hamster? What about 2 spiders and 1 cat?

Curious where the line is, is it always cats and dogs vs everything else?

If you do count all animals (beyond cats and dogs), do you get every single pet listed on the addendum? With pictures?