POWER OF ATTORNEY
                              (Section 16 Filings)

        Know all by these presents that the undersigned hereby constitutes and
appoints each of R. Michael Herrman, John Newland and Patrick Jones, signing
singly, the undersigned's true and lawful attorney-in-fact to:

     1. Execute for and on behalf of the undersigned, in the undersigned's
        capacity as an officer, director or greater than 10% shareholder of
        PetIQ, Inc. ("PetIQ"), Forms 3, 4 and 5 in accordance with Section 16(a)
        of the Securities Exchange Act of 1934 and the rules and regulations
        promulgated thereunder;

     2.	Do and perform any and all acts for and on behalf of the undersigned
        which may be necessary or desirable to complete and execute any such
        Form 3, 4 or 5, complete and execute any amendment or amendments thereto
        and timely file such form with the United States Securities and Exchange
        Commission and any national quotation system, national securities
        exchange, stock exchange or similar authority; and

     3.	Take any other action of any type whatsoever in connection with the
        foregoing which, in the opinion of such attorney-in-fact, may be of
        benefit to, in the best interest of or legally required by the
        undersigned, it being understood that the documents executed by such
        attorney-in-fact on behalf of the undersigned pursuant to this Power of
        Attorney shall be in such form and shall contain such terms and
        conditions as such attorney-in-fact may approve in such attorney-in-
        fact's discretion.

        The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Power of Attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is PetIQ assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

        This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by PetIQ, unless
earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in-fact.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 5th day of March, 2019

                                            /s/ R. Michael Herrman
                                            ---------------------------------
                                            Name: R. Michael Herrman