Raw food causing mucus stools in Aussie Shepherd

Mucus in stools two weeks into a raw switch is really common — it usually means the gut is still adjusting, though it can also point to a specific protein or fat level that isn't sitting right with your dog. True food allergies are less common than intolerances, but a sudden diet change can definitely trigger inflammation in the digestive lining. Before we dig in: is your Aussie Shepherd showing any other symptoms alongside the mucus — loose stools, increased frequency, any blood, or changes in energy? And what raw food are you feeding, and how did you transition onto it?

That's actually really useful — the transition sounds sensible, and mostly formed stools are a good sign. The issue is likely the beef mince itself. Plain muscle meat without bone or organ is nutritionally incomplete, and more importantly, it's very high in fat compared to a balanced raw meal. That excess fat can irritate the gut lining and cause exactly the mucus you're seeing. It's not an allergy — it's the imbalance. Have you noticed if the mucus is worse on certain days, or is it consistent every time he goes?

It could be beef sensitivity, but I'd put money on the fat content and nutritional imbalance being the main culprit before calling it a true intolerance. Either way, the fix is the same: switch him to a properly balanced complete raw food that has the right bone-to-meat-to-organ ratio, and ideally use a novel protein like duck or turkey so you're ruling out beef at the same time. My recommendation for your Aussie would be Natures Menu Country Hunter pouches — they do a duck or turkey variety, they're a complete balanced raw meal (not just muscle meat), and they're much gentler on the digestive system than unbalanced butcher mince. They're widely available on Amazon UK and straightforward to portion for a 3-year-old medium-large dog. Give it two weeks on that and I'd expect the mucus to clear up significantly.

For a healthy, active 25kg adult Aussie, you're generally looking at around 2–2.5% of body weight per day in raw food — so roughly 500–625g daily. Natures Menu Country Hunter pouches come in 300g, so two pouches a day is a solid starting point. Because you're switching protein as well as format, do a clean swap rather than mixing with the beef mince — just start fresh on the new food. If stools firm up and the mucus clears within a week or two, you've found your answer. If mucus persists even on a balanced complete raw, that's when it's worth a vet visit to rule out something like a parasitic infection or inflammatory bowel issue.

Given he's otherwise well — good energy, no blood, mostly formed stools — it's completely reasonable to try the diet change first. If the mucus hasn't improved after two weeks on the balanced raw, or if you see blood, a sudden change in energy, or he goes off his food at any point, then yes, get the vet involved. But in your situation, the dietary fix is the most logical first step, and most dogs respond quickly once the imbalance is corrected.