FYI I tried to take Chop with Franklin in the Chilliad Park, and normally i could find some pumas, deers and all that but i can confim that CHop "deactivate" other animals, except birds (i have to try for coyotes , in sandy shores) .
I tried all the places that i know that spawns animals but it doesn't work, too bad i was excited to to do some hunting with Chop.
This is exactly what i noticed as well. Same as seeing several dogs when in Sandy Shores as Trevor and probably Michael too, but when walking around as Franklin with Chop,....no dogs to be seen.
Is it just me or is RDR clearly better when it comes to the wildlife? So far as for animals that attack me have been only cougars and boy are they annoying too. In RDR you got a second chance but here they just kill you instantly...yeah realism i know. But i don't know, i was expecting more different animals in the wilderness. Also bears? I haven't seen a single one.
Still though, in total there is a nice amount of animals in there, but hard to find.