Pet Fountain Filter

FIG. 1 is a top right perspective view of the pet fountain filter showing the design, wherein the broken lines form no part of the claimed design;

FIG. 2 is a top left perspective view of the pet fountain filter showing the design, wherein the broken lines form no part of the claimed design;

FIG. 3 is a front elevational view thereof, wherein the broken lines form no part of the claimed design;

FIG. 4 is a rear elevational view thereof, wherein the broken lines form no part of the claimed design; a top plan view thereof,

FIG. 5 is a left side view thereof, wherein the broken lines form no part of the claimed design;

FIG. 6 is a right side view thereof, wherein the broken lines form no part of the claimed design;

FIG. 7 is a top plan view thereof, wherein the broken lines form no part of the claimed design; and,

FIG. 8 is a bottom plan view thereof, wherein the broken lines form no part of the claimed design.