Do they mean the same?
My favourite animal is dog. Incorrect, you need an article.
My favourite animal is the dog. Correct. However, this may be misunderstood and people might think you mean one specific dog.
I think "My favorite animal is a dog." is even more likely to be interpreted as referring to a specific dog.See above. You can also say "My favourite animal is a dog". This is more general.
20061.My most favourite fruit is (the apple)(apples).
2. My most favourite food is pizza.
3. I like orange the most. It's my favourite color.
4. I like oranges the most. It's my favourite fruit.
What is the difference between 'I like dog.' and 'I like dogs.'?
Does 'I like dog.' mean 'I like eating dog meat.'? yes