"The more [cats] we can get off the streets, desexed and into homes, hopefully the population will reduce over the years."
Flis said pet owners needed to be extra vigilant during the current streak of scorching weather.
"We do see an escalation of dogs in hot cars.
"The hospital is one particular spot where people think they're just popping in, but your 10-minute appointment is now taking two hours.
"Our advice is to always leave them at home, or leave them with a friend or family member."
Adequate water and shade was very important for all animals, from domestic to livestock, Flis said.
"Just think how thirsty we get. It's the same for our animals.
"One thing we've had good success with is pet cooling mats, which you can purchase from most pet stores. It's a gel pad that you can out in the fridge. That's particularly good for elderly animals who might be struggling a bit at the moment."
Exercising dogs during dawn and dusk is also recommended.
"That concrete gets really hot, as does the iron sand on the beaches here. It's like sticky, hot tar," Flis said.
'Everyone's struggling in this heat. It's been a crazy summer and it's only just beginning."
Flis said applications for animals could be made online through the SPCA website, along with appointments.
"It's quicker and easier for the people adopting and it's a good way to match the people to the pets.
"It saves time at reception too. That means we can spend more time with the animals."
Donations of food from the public had bolstered stock at the facility, Flis said.
If an owner was struggling to feed their pet, they were welcome to come to talk to staff.
"Covid takes a hit on people, and while we may not be in a position to help we always do what we can."
If you're interested in adopting an animal, head to www.spca.nz/adopt