Is cloud.petcare-us.mars.com a scam or legitimate? Right now, the site simply doesn't work — it returns a 404 Not Found error, meaning the page doesn't exist or isn't live. Even in its current broken state, we can evaluate what a working version would need to inspire trust.
For a pet care website, you would expect a clear about page, a phone number or email, and links to a privacy policy and terms of service. This site has none of those. It also has no history in the Wayback Machine and no social media presence. Compare that to any established pet service, which typically has years of visible operations and customer contact channels.
Because the site is essentially anonymous and unavailable, the safest advice is to steer clear. No pet care service worth using hides its identity this completely. If you need pet care products or services, look for businesses with verifiable contact information, a working website, and customer reviews on platforms like Yelp or Google Business.