Hi Tom,
First, thanks for adopting this senior gal! I would not feed that food. No offense to your vet but they get very little nutrition education.
Years back, we adopted a senior dog who was obese. She should have weighed about 25lbs but was 43.7. We used Wellness Core reduced fat & she lost the weight. For snacks, you can use some of her kibble from her daily ration, fresh green beans, we use The Honest kitchen quickies but they’re costly.ni think Buddy biscuit itty Bitties and Charlee Bear treats are low calorie.
What supplements are you using? I’ve used Joint Mobility Plus (from SwansonVitamins.com), green lipped mussel, salmon oil, Liquid Gold K9 and salmon oil for ours with bad joints.
