As long as the animal is alive at the time of slaughtering, its meata would be halal.
And Allah knows best
It is not obligatory to feed our pets Halal meat or food, though it is better to do so if we can, but it is not Haraam to feed our pets non Halal food. Non Halal food is Haraam (not allowed) forus but not Haraam on animals.
It is not Makrouh to eat liver nor brain of Halal animal but it is Haraam to eat the gland inside the brain.
It is Makrouh to eat the kidney of Halal animal, as well as the veins and two small parts of meat out of the heart of the animal which are called the ears of the heart آذان القلب.
Thank you for your question. It is not permissible to eat meat which has not been slaughtered according to Islamic law, except in a situation of starvation, where there is no alternative (no other food at all) and at that point a person is allowed to eat only the amount that is necessary for survival. In Western countries this type of situation is not usual and there are plenty of alternatives to eat such as fish with scales, prawns, vegetables and other types of carbohydrates (bread, rice, pasta) and so on.
May you always be successful
Yes we can say that because the God of Prophet Ibrahim is none but Allah.