A full groom can cost up to $90, with belly clips starting at $10.
Bree Taylor, owner of Studio Hound in Epsom, said demand had gone "nuts" in recent weeks.
"I have the phone hooked to my shoulder dealing with inquiries while I am clipping," she said.
"Owners have noticed their dogs panting, drooling and lying about on concrete trying to cool down."
National pet chain Animates has seen a significant spike in its $10 in-store DIY dog-wash service.
Roseanne Silcock of Animates said there had been a "massive" increase in people queuing to run their pet through a cool shower at dog stations in recent weeks after they had been to the beach.
Animates offers a variety of dog pampering services, including a $109 Platinum Groom complete with a pedicure and facial, resulting in a "kissable" dog.
Five tips to cool down your dog
• Indoors, switch on an electric fan. Outside, make sure the dog has plenty of shade from the sun.
• Put your pooch in a kids' paddling pool, but make sure it can get in and out safely by itself.
• Ice cubes in a drinking bowl will keep the water cold longer.
• Wet a towel, wring it out and put it in the fridge. Then place it on the floor or deck for the dog to lie on.
• Buy a cooling pad from Bunnings for your dog to lie on.
Source: Hair of the Dog