Underweight Whippet food advice

A Whippet who eats consistently but stays chronically underweight is a real puzzle — and it's worth taking seriously, because 'eats fine but stays thin' can mean a few different things. Before I suggest anything, I want to ask a couple of questions. Has your vet ruled out underlying causes — things like intestinal parasites, exocrine pancreatic insufficiency, or a gut absorption issue? And what are you currently feeding, and roughly how much per day? Whippets are naturally lean dogs, so it's also worth knowing: what does 'underweight' look like for yours — are ribs very prominent, is there muscle wasting, or has a vet flagged it?

That's really helpful — and actually quite telling. If she's eating above the recommended amount of a mid-range kibble and still not holding condition, the food itself is likely the issue rather than the quantity. Mid-range kibbles are typically around 340–360 kcal per 100g, and they often use a lot of their bulk for carbohydrate fillers that Whippets in particular don't utilise especially efficiently. What kibble are you on at the moment, and do you know roughly what the protein percentage is? I'm also curious whether she's very active — does she get regular off-lead running?

That explains a lot. Harrington's is a decent everyday kibble, but it sits around 330 kcal per 100g and the protein is relatively modest — it's designed for average activity levels in average dogs. A Whippet doing two serious sprint sessions a day is burning significantly more than the formula is built to support, and the calorie density just isn't there to compensate even at above-guide quantities. You'd need to feed a large volume to close the gap, and at some point you hit digestive limits before you hit caloric needs. The straightforward fix is switching to a genuinely high-calorie, high-protein kibble rather than just feeding more of what you have. My recommendation would be Orijen Original — it runs around 390–400 kcal per 100g, the protein sits above 38%, and it uses named whole meats as the primary ingredients rather than cereal fillers. For an active, lean Whippet with a vet's clean bill of health, it's one of the most effective switches you can make. You'd likely reduce the volume slightly compared to what you're feeding now, but she'd be getting meaningfully more usable energy. It's available on Amazon UK in 2kg and 6kg bags — I'd start with the 2kg to see how she takes to it before committing to the larger size.

Definitely transition gradually — mix about 25% Orijen with 75% Harrington's for the first three days, then 50/50 for another three, then 75/25, and fully switched by day ten or so. Whippets can have sensitive stomachs and a hard switch on a richer food can cause loose stools, which would actually cost you calories in the short term. For something to add right now while you wait: a tablespoon of sardines in spring water (not brine, not oil) mixed into her existing meals is a genuinely good short-term calorie and omega-3 boost, and most Whippets take to it enthusiastically. It won't transform her condition overnight but it's safe, useful, and something you can pick up today. Once you're settled on Orijen, give it six to eight weeks before you reassess her condition — muscle recovery takes time even when the calories are right.

It's a fair concern but an unlikely problem for a dog in her situation. With the activity levels you're describing, you have quite a lot of headroom before you'd overshoot — and Whippets tend to self-regulate reasonably well once they're on a food that actually meets their needs. Keep an eye on her ribs: you should be able to feel them easily but not see more than the last one or two. If you start to lose definition of the ribs entirely, trim back by 10–15% of her daily portion. But given where she is now, I'd be very surprised if overshoot is your problem. The more likely outcome is that you'll finally start to see her fill out properly around the hindquarters over a couple of months, and then plateau naturally.