_dog()
{
    cur=${COMP_WORDS[COMP_CWORD]}
    prev=${COMP_WORDS[COMP_CWORD-1]}

    case "$prev" in
        -'?'|--help|-v|--version)
            return
            ;;

        -t|--type)
            COMPREPLY=( $( compgen -W 'A AAAA CAA CNAME HINFO MX NS PTR SOA SRV TXT' -- "$cur" ) )
            return
            ;;

        --edns)
            COMPREPLY=( $( compgen -W 'disable hide show' -- "$cur" ) )
            return
            ;;

        -Z)
            COMPREPLY=( $( compgen -W 'aa ad bufsize= cd' -- "$cur" ) )
            return
            ;;

        --class)
            COMPREPLY=( $( compgen -W 'IN CH HS' -- "$cur" ) )
            return
            ;;

        --color|--colour)
            COMPREPLY=( $( compgen -W 'always automatic never' -- $cur ) )
            return
            ;;
    esac

    case "$cur" in
        -*)
            COMPREPLY=( $( compgen -W '$( _parse_help "$1" )' -- "$cur" ) )
            return
            ;;

        *)
            COMPREPLY=( $( compgen -W 'A AAAA CAA CNAME HINFO MX NS PTR SOA SRV TXT' -- "$cur" ) )
            ;;
    esac
} &&
complete -o bashdefault -F _dog dog