My almost 12 year old JRT is eating All Life Stages food and I wouldn’t switch to senior food ever. I’m not saying Wellness is this way, because I think they are one of the better senior foods, but most senior foods cut back on protein just when dogs start not absorbing all the protein from their food so may actually need more high quality protein in their diet than they did when they were younger.
If I were you, I would cut her food back a bit more and work at making her more active. Carrying the extra weight is probably part of why she doesn’t feel like doing much. Her joints are probably starting to hurt. Maybe use some of her food to start doing some trick training or something else that would get her moving.
