Modal verbs

1) Mice are used in experiments. Dolphins were used by US Army to find underwater bombs and save people from the destroyed ships. Pigeons were used for mail delivering. Dogs are used as guides , hunters, and guards.

2) We use sheep, pigs, cows and chickens as food. People still use horses for transportation.

3) It seems to me not, since they do not know how to talk humanly.

We use these animals in the following way: they can act as agents (a dolphin can defuse sea mines, a rat can smell a nuisance), they can also be suppliers (like pigeons to send letters).
2. I would also like to tell you about the dog's abilities. Dogs can work in the police, help in finding people or lost things.
3. Yes, of course they can, we have seen it in the examples considered.But I think that animals should not risk their lives for the sake of the lives of people who create problems for themselves.It's low and stupid.

1) Mice are used for research. Dolphins to teach people to swim or just for fun. Pigeons are used to send letters. Dogs can guard the house.
2) Snakes can do massage. And leeches suck out excess blood.
3) Dogs Can be Secret Agents to Defuse a bomb.

1. We saw a lot of interesting things. People use animals to save human life or for covert operations.
2. I also want to talk about horses. People use this animal for fast movement.
3 Yes, I think they can. Nobody can imagine whether a pigeon is sending a letter or just flying and if you are a spy and you have mines, you never know if delphine will neutralize it. But I think that this is not very good, I think that we should not use someone for the sake of our existence.