My dachshund got into a container of treats and is bloated

Last night, my cat opened a container of treats - soft chews and small dental treats - and knocked it on the floor where my mini dachshund (Charlie, 15, 8 pounds) had a big snack. I didn’t notice anything abnormal this morning - he was acting fine, drinking like normal, did not appear bloated. I gave him a smaller dinner than normal this evening and I only just noticed his stomach is distended. He’s been acting normal other than his stomach being tight. I can’t get to a vet until at least tomorrow. Is this something that I can just monitor and take him in if he seems distressed or should I try to get him in sooner? Attached of photo of the offender referenced.