If l could have an animal as a pet, what iswould be my chooseice? If l could have an animal as a pet, what would be my choice?

Other ways you could say this: "What I would choose if I could have any animal as a pet" "If I could have any animal as a pet, what would I choose?"

If l could have an animal as a pet, what is mywould I choose? If l could have an animal as a pet, what would I choose?

You might already know this, but here's a reminder just in case: when a word starts with a vowel, you use "an". For all other words that don't start with vowels you would use "a". An exception would be "one". Since it sounds like it starts with the letter "w", we usually say "a" in front of "one". So for example, we'd say "a one point lead" instead of "an one point lead". Also, while using "an" is okay in this sentence, I think saying "If I could have any animal as a pet" would sound a bit better. But both work

l think l willould choose thea dog as that has three advantages, o. One of the advantages is that l feel theat dog iss are so cute and very loyal so my pet would never will leave me. l think l would choose a dog as that has three advantages. One of the advantages is that l feel that dogs are so cute and very loyal so my pet would never will leave me.

Since this is a hypothetical situation, you should use "would" instead of "will." If you are certain that something is going to happen, then you can use "will."

l think l willould choose thea dog as thait has three advantages, o. One of the advantages is that l feel thea dog is so cute and very loyal, so it never will leave me. l think l would choose a dog as it has three advantages. One of the advantages is that l feel a dog is so cute and very loyal, so it never will leave me.

and tThen, when l go out, the dog can protect my home don't be robbed if havefrom robbers. Then, when l go out, the dog can protect my home from robbers.

and tThen, when l go out the dog can protect my home dso I won't be robbed if have robber. Then when l go out the dog can protect my home so I won't be robbed.

bBut anyway, the dog must be a big dog. But anyway, the dog must be a big dog.

but aAnyway, the dog must be a big dog. Anyway, the dog must be a big dog.

You could also say "The dog must be a big dog, though."

The last advantage is theat dog is ours are man's best friend and a good listeners, so l willould choose thea dog. The last advantage is that dogs are man's best friend and good listeners, so l would choose a dog.

"Man's best friend" is the expression you're looking for here

The last advantage is theat a dog is our best friend and a good listener, so l willould choose thea dog. The last advantage is that a dog is our best friend and a good listener, so l would choose a dog.

When talking about dogs, we usually say they're "man's best friend" in English, but saying "our best friend" is also okay I think. It has the same meaning and I don't think it sounds weird.