1. Look at the abandoned dogs.

2. Look at the deserted dogs.
(Which one is a correct term? Can we use both expressions? Do you have some other terms?)

3. A dog is a companion animal. I have two companion dogs.
(Is this expression right?)

Look at the abandoned dogs makes more sense because it states that the dogs are ownerless. "Deserted" indicates more of an empty setting like "the town is deserted" meaning there is no one there.

So 1 is better than 2.

3 would work. It strongly suggests you rely on the dogs for physical or even moral guidance rather than simply having two dogs as pets.

Yes, 1 and 3 are fine.

1. Both expressions, "abandoned dogs" and "deserted dogs," generally refer to dogs that have been left or abandoned by their owners. However, there is a slight difference in connotation between the two terms. "Abandoned dogs" implies that the dogs have been intentionally left behind, possibly due to negligence or cruelty. On the other hand, "deserted dogs" suggests that the dogs have been left alone or abandoned, but it may not necessarily imply intentional abandonment.

2. In terms of usage, both expressions can be used interchangeably in most cases to convey the same meaning. However, the choice of words may vary depending on the context or personal preference.

3. The expression "a dog is a companion animal" is correct. Dogs are commonly referred to as companion animals because they have a longstanding history of being domesticated and living alongside humans as loyal and trusted companions. Therefore, it is appropriate to say "I have two companion dogs" to indicate that you have two dogs that fulfill the role of companions in your life.