Thank you very much. Each scene you pointed out has some problems, but the strange thing is that the consistency of the number of topics / predicates is not one of them.
Unlike many other languages in English, nouns must match pronouns and adjective numbers and gender (in most cases).
You miss the article "the" that a dog is singular. "Yes" does not need to agree with other contents in the sentence, you do not have to agree "dog" and "animal" without fail.
All these are correct, with respect to the quantity requirement *, there is no match between the subject and the predicate.
However, if you decide to change the meaning of a sentence to reflect more abstract things, you can omit that article altogether.
In this case, no article is necessary. You are not talking about dogs and many dogs, you are only talking about dogs.
You can also generalize it by discussing an example of a class using / an with a single countable noun (meaning "any").
You can not use / an like this when advertising all the members of a group at once.
(The tiger is not in danger of extinction.The sentence relates to the whole family of the tiger, not related to individuals.)
My favorite animal is a dog. I like dogs because they are very fluffy. You can ruin some of them and I like dogs as they do not bite. Sometimes they bit people. I like dogs again. Because they may be of various sizes and types. They are occasionally good, and they may be mean. However, they are usually very good. Because they do not hurt you, I just like good dogs.
I really like animals, but my favorite animals are dogs. 4 feet, brightly shining eyes, and strong smells distinguish themselves from other animals. They are very strong, very affectionate and loyal to the owner. There are many kinds of dogs, such as greyhound, bulldog, racing dog, Brad Hound. They have sharp teeth, and their hearing is typical. I have a dog named Murphy. It is an American Labrador dog wearing a black jacket. It's two years old, very smart, agile and active. It has long ears and long tails. Every dog is very loyal and loving. They are very affectionate to all animals. I always wanted to keep a dog, but when my friend gave me a pretty puppy, I was very happy. He is only 30 days old and very fragile and soft. I know that it is mine, as I saw it waving the tail
The shepherd's dog is a crazy dog. These kinds of dogs can teach you so much. They are very intelligent animals. In fact, they are the second most popular dog in the world. Shepherd is one of my favorite dogs, it is definitely a beautiful animal. Shepherds are very cautious and very curious. They are also very faithful and they always think they are bosses when they are with other dogs. They are super-smart animals. The shepherd has a strange history. These kinds of dogs
My personal favorite group of dogs is the Herding Group. Shepherd's dog, Border Collie and German Shepherd (my favorite). This is a wonderful smart dog group. They were members of the working group and were divided into their own groups in 1983. "All varieties have magical abilities to control the movement of other animals" (AKC.org). If you have time to train and exercise, these dogs can make wonderful, obedient pets. I forgot to mention important things, but a sports group. This group includes many popular varieties like Cocker Spaniel, Labrador Retriever and Golden Retriever. These are all common sight of the family today. "Natural activities and agility, sports dogs become cute, comprehensive partners" (AKC.org). Their excellent personality and size make these dogs like golden retriever and laboratory very suitable for working with disabled people and patients.