You seem to be asking for a manual, asking questions like that without signs of research or try on your part?
Do you want to do this on Fallout or Fallout 2 engine? Fallout 1 engine is less handy for scripting, and I never did anything on it so I can't help with this engine.
On Fallout 2, to start with you will need the following tools.
https://www.nma-fallout.com/resources/sfall-script-editor.77/
https://www.nma-fallout.com/resources/fallout-2-proto-manager.73/
And Bis mapper, which I am too lazy to find the link for you right now. Look in the download section.
1, You're gonna need new art for teeth and dog's hide, as I don't think there is something close in the original art. Take a look in the fallout database, in case someone made something alike:
https://www.nma-fallout.com/threads/fallout-database.200205/
Or look up tutorials on new arts and the tools to make them:
https://falloutmods.fandom.com/wiki/Fallout_2_tutorials
Then in dogs script ssl, in it's destroy_p_proc procedure for example, you will need to do something like this with sfall script editor, then compile it:
Code:
procedure destroy_p_proc begin
variable item1;
variable item2;
item1:=create_object_sid(532, 0, 0, -1);
item2:=create_object_sid(533, 0, 0, -1);
add_mult_objs_to_inven(self_obj,item1,1);
add_mult_objs_to_inven(self_obj,item2,1);
end
Here, 532 and 533 are pid numbers you could choose for your new proto files, which will obviously need to exist and be correctly registered first in your mod files. I am more or less willingly only giving you pieces of the puzzle, if only to make you understand that you can't expect a full answer by just asking questions, without working yourself to figure how it work.
I could confuse you more (I guess you are confused if you just read) by giving you pieces of answers on 2 and 3, or I could just suggest you do what everyone interested in modding any game must do to start with. Messing with available tools, read tutorials that will give you headaches, studying the game files, step by step trying and failing, step by step trying and succeding in something that work, ect...