Ruling on feeding an animal more than its capacity for the sake of fattening it

Question:
Our brother asks this question and says: Opening the bird's mouth and giving it grains, which may be more than its capacity so that it fattens quickly, is this permissible or not?

Answer:
This requires a detailed explanation: If the bird is sick, meaning it needs someone to feed it, there is no harm in giving it what it needs, with caution so as not to harm it. However, if the bird picks up its food and eats by itself, there is no need for this action, because it may harm and hurt it. We are commanded to be gentle with animals, not to hurt them, not to wrong them, and not to strike them except out of necessity. Therefore, forcing food into its mouth with the intention of fattening it is not appropriate, because there is a fear of harm in it.
The point is: The obligatory approach is to distinguish: If the bird or animal is healthy and eats by itself and picks up the grain by itself, there is no need for all of this. But if it is sick and unable to eat, and needs someone to raise the food for it, like a human being helping, it should be helped in a way that does not harm it. Yes.

The presenter: But if the intention behind this, as he said, is to make it fatten quickly?

The Shaykh: No, that is not permissible. It is not permissible if it harms it. But if it does not harm it, but rather he provides it with food and strives to give it good feed, that is fine. But if it is done in a way that harms or hurts it, no.

The presenter: May Allah reward you with good, and may He benefit us with your knowledge. I saw, O Shaykh, some people injecting birds with water when selling them in order for them to have a certain appearance at the time of sale. Perhaps there is some deception in this?

The Shaykh: This is not permissible, because this means deception. It misleads people into thinking that they are fat and large, when that is not the case. Anything that misleads the buyer or customer contrary to the truth is not permissible, because the Messenger (peace and blessings be upon him) said: He said (peace and blessings be upon him): "And when he passed by a pile of food in the market and put his hand in it, his fingers came out wet, so he said: He said: It was hit by the sky, O Messenger of Allah—meaning the rain. He said: It was narrated by Muslim in the Sahih.
The point is: It is obligatory upon Muslims to advise one another and not to deceive. So anything that makes the buyer unaware of the truth in the sale of an animal or anything other than an animal is not permissible.

The presenter: May Allah reward you with good, and may He benefit us with your knowledge.