Mr. Squeals the pig is a caricature of W.C. Fields. The "sawdust cynic" in the third row is Charlie McCarthy, Edgar Bergen's dummy. The film parodies the rivalry these two figures had on radio.
The Russian Wolfhounds who pause to do a spirited Cossack style dance were part of the era where all things Russian (imperial, not Soviet) were in vogue. Music, fashion, dance and film all showed the influence, even cartoons, as shown here.
Prohibition ended in the US just five years prior, so America had fallen in love (again) with the cocktail. The rescue dog has quite an array of mixers, as shown.