This issue is a variant of XYZ Comics (Kitchen Sink Press, 1972 series) . There exist further variants.
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
All printings say which printing in indicia information.
1st print June 1972 has 0.50 USD cover price. 2nd print March 1973 has 0.50 USD cover price.
3rd print October 1974 has 0.75 USD cover price. 4th print May 1976 has 0.75 USD cover price.
5th print September 1977 has 0.75 USD cover price. 6th print February 1979 has 1.00 USD cover price.
7th print 1998 has 2.95 USD cover price.
This index lists the contents of the 6th printing ($1.00 cover). Earlier print contents may differ?
Sequence starts on inside of front cover.
Sequence ends on back cover in color. As Crumb stated in The Complete Crumb vol. 9, this story is based on a visit he made to his brother at a mental institution. A lot of the dialogue was either written by Charles or transcribed from conversations Crumb had with him. These two funny animal characters are from Charles's childhood comic book making days.