My bet this one is about drugs, probably xtc pills. The guy has quite a stash, and needs to get rid of it fast for some reason. 20$ a piece seems about right for 2015, albeit on the high side. Also, the word "bean" is old slang for xtc, tough not commonly used. Apparently, he has pills from different batches (some are sassier than others), and pills from different batches can be combined (they are very respectful and amicable with one another).

The cat&dog reference seems to be about how well his pills mix with other drugs, which, for anyone buying pills in these quantities, should be a considerate point of concern, as xtc is often mixed with other drugs. 'Cat' probably refers to Ketamine, which can be mixed with xtc to heighten the experience. Could also mean cocaine, but that drug is not commonly used in combination with xtc. 'Dog' is known slang for heroin (which can be combined with xtc, even though that is a rare practice). Other contestants are plain old alcohol, cannabis or GHB, which are either hardly ever combined with xtc, or generally mix so well that they wouldn't warrant a special mention.