Only mix foods for the same species and life stage (i.e. don't mix dog and cat food, or puppy and adult food together). Make sure both foods are nutritionally complete and balanced, with similar nutrient profiles.
Can I feed my dog different brands of wet and dry food?
It is not typically not a problem to offer to different brands of food especially if you are using small amounts of canned food to entice her appetite. If you cannot find a large breed puppy formula canned food, then I would use an adult version. Being a giant breed dog, you what her to grow very slowly.
Can you give a dog different dog food?
Switching your dog's food abruptly can cause gastrointestinal upset such as vomiting, diarrhea, and a decreased appetite. Any time you decide to change your dog's food, you should transition to the new diet gradually in order to give your dog's system time to adjust to the change.
Is it bad to mix up your dog's food?
Many pet foods are formulated with a specific life stage, lifestyle and sometimes even health condition in mind. Mixing foods willy-nilly without taking this into consideration can inadvertently impact your pet negatively, including causing undesired weight gain, overexposure to certain vitamins and minerals, etc.
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