Most of us are unaware that milk is used in the processing of sausages. Though meat is generally considered a dairy-free product, milk constituents are used in the preparation of sausages, especially the light colored varieties.
You should check the list of ingredients listed in the sausage packaging if you are prone to milk allergies or are lactose intolerant. Don't buy the product if any of the items you ought to stay away from appear in the list. If there is no packaging then it is always better to ask the employees in the butcher's shop or delicatessen or bakery. Most of them would be able to guide you on the constituents of the meat and the preparation method. If they are unable to help, then it is a good idea to steer clear of these consumables.
Besides sausages, dairy ingredients are also found in hot dogs and luncheon meat. Producers also frequently use Casein as a meat binder. Moreover, slicers in delis may be used for both cheese and meat in which case it is a safer bet to avoid buying from that store. Another variety that you may avoid if you suffer from severe milk allergies or lactose intolerance is beef. According to the US-based Food Allergy Research & Education, though most people with dairy allergies can eat beef without any problem, one study showed that nearly 8% of children with milk allergies also developed adverse reactions to this product. So if you prefer to err on the side of caution, you may choose to skip beef completely from your menu - though we would suggest you get some tests done before you start to curtail your food options. Your doctor would be able to help you decide if you ought to skip beef at all.
There are quite a few companies that manufacture dairy-free sausages and hot dogs. You may make a readily available list of locally available produce and items that are safe to eat. This will help you avoid any time wastage or undue stress in pouring through the list of constituents and then deciding on your purchase. Your doctor or dietitian can also easily guide you on the manufactures and the products you can eat with impunity.