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Can I dress my pets up for Halloween? Charities' latest advice
There's lots of spooky outfits around during Halloween - and you might see some pictures on social media of people dressing up their pets.
However, the RSPCA, a charity that looks after animals, told Newsround that dressing pets up in clothes that aren't suitable for them can be "quite stressful" for the animals, and have warned people against it.
Vets in the UK also agree, and say that "animals really don't like to be dressed up".
Don't worry though - you can still get your pets into the spooky spirit without dressing them up.
Pet costumes are extremely popular at this time of year - so much so there are even parades around the world to show them off.
Whilst seeing your furry friends in cute and spooky outfits can be fun, they might not be enjoying it.
"It's really important that pet owners think about how dressing up pets can make them feel, as whilst some animals may not mind being dressed up, other pets may find this worrying and even scary," the RSPCA explained to Newsround.
Pet clothes that serve a practical purpose are useful they said, such as if it's incredibly cold or if the animal needs to be prevented from licking a wound.
"But it's important your pet is comfortable so it's a good idea to avoid anything which stops them behaving like they usually would, causes them to overheat, restricts their movement, or traps them," the animal charity explained.
And vets in the UK agree. Justine Shotton is the vice president of the British Vets Association, a group that represents vets.
She told Newsround: "While some pets may put up with it, they really don't enjoy it, and it can cause them to get stressed, get too hot and struggle to breathe properly."
And it can particularly affect certain breeds: "This can be a serious problem for dogs like pugs and French bulldogs, who can already have breathing problems because of their flat faces and squishy noses."
"Our pets already have lovely coats which look great and keep them the perfect temperature, so they really don't need to be dressed up in costumes."