bash-3.2$ guile
GNU Guile 2.2.4
Copyright (C) 1995-2017 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (define-record-type dog 
  (make-dog name breed age)
  dog?
  (name dog-name)
  (breed dog-breed)
  (age dog-age))
scheme@(guile-user)> (define my-pet
  (make-dog "lassie" "collie" 5))
scheme@(guile-user)> my-pet
$1 = #<dog name: "lassie" breed: "collie" age: 5>
scheme@(guile-user)> (dog? my-pet)
$2 = #t
scheme@(guile-user)> (dog? 5)
$3 = #f
scheme@(guile-user)> (dog-name my-pet)
$4 = "lassie"
scheme@(guile-user)>