Here are some possible reasons why your cats are hissing at each other in their new home:
Territory: Cats are territorial and may feel threatened by the other cat in their new environment. This can lead to them hissing, arching their backs, and fluffing their fur to make themselves look bigger.
Competition: If your cats are competing for resources such as food, water, or attention, this can also lead to hissing and conflict. Ensure each cat has its own food and water bowl and that they are fed at separate times.
Stress: Moving to a new home can be stressful for cats, leading them to be more irritable and likely to hiss at each other. Try to create a calm and comfortable environment for your cats and provide them with plenty of hiding spots where they can feel safe.
Unfamiliarity: If your cats are not used to each other, they may need time to get to know each other and build a relationship. This can take several weeks or even months.
Previous negative experiences: If your cats have had negative experiences with each other in the past, they may be more likely to hiss and conflict in the new home.
Medical problems: In some cases, hissing and conflict between cats can be due to underlying health problems. If your cats are hissing at each other and one or both exhibit other symptoms such as vomiting, diarrhoea, or weight loss, it's important to take them to the vet to rule out any medical causes.
If your cats are hissing at each other, it is important to stay calm and not overreact. Punishing or scolding your cats will only make the situation worse. Providing them with plenty of resources, creating a safe and comfortable environment, and giving them time to adjust to their new home will help reduce conflict and allow your cats to eventually live together peacefully.