Is a Canary Mastiff (Presa Canario) a very hard dog?

A couple days someone, I found a small box with an abandoned puppy. It said ''3 weeks old presa canario''. For a puppy, I have to admit it seems a bit bigger than other puppies.

I think all breeds are special in their ways but is that breed very hard to work on? It looks exactly like this puppy:

Is a Canary Mastiff (Presa Canario) a very hard dog?
Updates
+1 y
It's a female and she was hungry. I fed her. Someone apparently doesn't want it and I don't mind raising it but I wonder how challenging or hard is that breed. I never had a Presa Canario before.
Is a Canary Mastiff (Presa Canario) a very hard dog?
Post Opinion