Is behaviourist theory different for animals?

It depends on what [i]kind[/i] of factors.
Epigenetically inherited factors can have a MUCH greater effect on behavior and subsequent manifestations, than [i]genetically[/i] inherited ones.

Definitely... Look at domestic cats compared to their wild cousins... That behaviour has been selectedly bred into them

If you look into the domestication of wolves into dogs that is the most telling example. So not really.

Look at Ozgirl she has been well bred.

No