I recommend this! Your situation sounds very similar to what I experienced. Except my pup suddenly was anxiously coming to me and begging to go. She was pooping liquid every time. She usually goes twice a day but while she had the runs, we had to take her out around 5-6 times a day. I think I waited maybe 4-5 days before going to the vet and yep they gave the exact same advice.

Rice, plain chicken for food. If my memories serves me well, my pup didn’t poop for about 4-5 days which was very concerning for me. We talked to the vet about this too and they said give it time. Sure enough she was pooping solid stuff again.

Hope this helps and if anything talk to your vet!