Pet Head Colour Me Bad Barkin' Blue Hair Gel (13 ratings) Temporary coloured hair gel for dogs £8.99 Quantity: at £8.99 each Add To Basket Lots of fun can be had with your pup with this temporary, non staining coloured hair gel by Pet Head. Simply washes out! To use - place on fingertips and apply to coat. Use for spiking, tipping adding a streak or splash of colour. Test colour on lighter fur and avoid eye area. 50ml (1.7 fl. oz) tube.