Is it acceptable to mix Evolve Senior dog food with Evolve Weight Management food?

My mother has a 9 year old Golden Retriever and it is kinda overweight since she moved into a condo with no yard for the dog to run and play anymore. She feeds Evolve Senior and loves it, but would like to mix in Evolve Weight Management. I know that you should never mix different brands of food but not sure the rules of "same brand" mixing. PAWS, I have read your answers, if you are out there I need your help!! Thanks

Who told you that? People have all sorts of weird ideas of what diets are best for dogs, some quite fanatical. Dogs like humans will put on weight if they don't get enough exercise or are desexed or getting on in years, they will become over weight as their food intake (including titbits and treats) is beyond what they need to remain healthy, and goldens are food lovers, and will steal food if they can. I had one so know! Just don't over do the food. Cut the dried food down by the recommended dose too, add some raw meat or tinned fish with the oil and cooked veg to make a filler. Like a level cup of good dried food, your mum can mix it with some raw meat or fish and cooked veg, Poor a little hot water over it etc. No more than two and half cups, and give her the occasional raw bone to chew on, because the weight reduced stuff is generally lower in fat. That is all. Just check the packet nourishment analysis and see. You can mix it up. But to me that is a waste of time, just keep to the Weight Management
food, Cut by half the recommended dose and add meat/fish and veg to it.