Cats exhibit all sorts of strange and wacky behavior. For instance, you may find some cats licking windows or window screens. Sometimes, cats simply take a small lick and then ignore the window. Other times, you may notice that your feline obsessively licks the window. Either way, this behavior definitely isn’t the norm.

There are several reasons why your cat may exhibit this behavior. Usually, it isn’t a sign of any underlying problem or something to be worried about. Cats just have all sorts of strange behaviors—just like people!

However, there are some instances where you may want to pay attention. It can be hard to know the difference between an innocent lick and one that may point to an underlying health problem. In rare cases, repetitive licking can also reflect an underlying medical issue such as nausea or oral discomfort, but we’ll attempt to do just that in this article!

The 8 Reasons Why a Cat  Might Lick Windows and Window Screens

1. Condensation

Cats prefer to drink from natural, running sources of water. This behavior appears to be an evolutionary thing, as it is innate in many cats. While we can’t know for sure why this behavior appeared, it does seem that it likely developed because running sources of water are typically cleaner than stagnant water.

While natural, unpurified water is never going to be 100% safe, bacteria and pathogens typically develop more easily in stagnant water. Therefore, running water is usually cleaner. Cats that drank running water may have been more likely to survive than those that just drank whatever water is available, passing this behavior onto their children.

When the warm air inside your house comes into contact with a cold window, condensation can happen—just like it does around a cold glass of water. Water can form on the surface of the window, though not necessarily in huge amounts. Cats can interpret this water as “running” water, and some may lick the condensation from the window or from the cooler metal surface of window screens.

Of course, this isn’t enough water to keep your cat hydrated. However, cats typically are not thinking about that.

Some cats like drinking running water more than others. If your feline falls into this category, you may want to purchase a cat fountain, which provides running water for your cat to drink. In fact, many cats like water fountains, as they help maintain better water freshness and may encourage hydration.

2. Taste

There may be substances on your window and window screens that your cat finds tasty. Therefore, your feline may lick the window or screen simply because it tastes or smells good. We highly recommend using safe cleaning products for this reason. Cats may decide that they like substances that aren’t necessarily good for them, which can potentially make them sick in some situations.

Furthermore, some cats may like the coolness of the window. The cold window may feel strange on their tongue, which some cats appear to enjoy. Sometimes, the texture is also a defining factor. Windows are extremely smooth, and that unique texture is a draw for some cats. On the flipside, some cats may enjoy the window screen’s texturized surface as it provides a different tactile sensation.

Either way, some cats simply lick windows or window screens because they like to. It’s that simple.

3. Attention

If you pay attention to your feline when they lick the window or window screen, there is a likelihood that they will continue to lick these surfaces just because you pay attention to them. Initially, they may lick the window simply because they are curious or because of one of the other reasons on this list. However, after they figure out that this behavior prompts your attention, there is a chance that they may continue licking windows or screens for attention.

Of course, there isn’t necessarily anything troublesome about this behavior. Licking the window usually doesn’t cause any problems for your cat. Plus, there are several more troublesome ways for your cat to get your attention!

As long as it isn’t bothering you, there typically isn’t a problem with letting your cat lick the window or window screen for attention. However, gently redirecting your cat toward a more desirable behavior and rewarding that choice can help prevent attention-seeking licking from becoming a reinforced habit.

4. Curiosity

As we’ve hinted at before, some cats start licking windows or window screens simply because they are curious. This trait varies from cat to cat, though all cats are curious in one form or another. Some cats may only like a window once out of curiosity and then never do it again. However, others are extremely curious and may do it more than once.

Of course, this is much more common in younger cats. Like most animals, younger cats seem to be more curious than older cats. However, this doesn’t necessarily mean that older cats won’t like a window or screen because they aren’t curious—older cats have typically already licked windows when they were younger, so there is little curiosity about this practice.

Window screens, with their mesh texture and scent-trapping surface, may also invite exploratory licking in some cats, as environmental odors or outdoor airflow can draw a cat’s interest more strongly than plain glass.

5. Window Material

Windows can technically be made out of all sorts of different things. Glass is quite common. However, plastic is common as well. Some types of plastic contain processing additives or residues, which may produce faint odors that some cats investigate orally. Therefore, some cats may still lick plastic—including plastic windows or window screens with plastic mesh.

If your cat seems to be obsessively licking the window or screen, then it may be because the material retains environmental scents or has a texture your cat finds interesting.

Other plastics can contain non-harmful manufacturing compounds. While we typically can’t pick these up, some cats can detect subtle odors. Therefore, there is always the possibility that your cat finds a particular scent from the window or screen material interesting. Other cats may not care about them at all, though. It all depends on the exact plastic used and your feline.

6. Stress or Anxiety

Some cats turn to unusual oral behaviors, including licking non-food surfaces like windows or window screens, when they’re feeling a bit overwhelmed. This can happen during changes in the home environment, disruptions in routine, or the presence of unfamiliar animals outdoors. Licking may serve as a self-soothing behavior, similar to how some cats overgroom when anxious. If the licking seems to increase during tense moments or is paired with other subtle stress signals, such as hiding, decreased appetite, or increased vigilance, your cat may simply be coping with emotional discomfort. Ensuring your cat has predictable routines, plenty of vertical space, and species-appropriate enrichment can help reduce stress-related licking.

7. Underlying Medical Discomfort

While uncommon, some cats may lick windows or screens when they’re experiencing mild nausea or oral irritation. Conditions such as dental disease, gastrointestinal upset, or even certain metabolic disorders can contribute to this pattern. If your cat suddenly begins licking windows more often, seems restless, drools, eats less, vomits, or shows any signs of mouth discomfort, a veterinary check-up is a good idea. Identifying and addressing any underlying medical issue early can prevent the behavior from escalating and keep your cat feeling comfortable and healthy.

8. Pica or Nutritional Imbalance

In some cases, licking non-food objects like windows or window screens can be an early sign of pica, a behavior where cats seek out unusual items to lick, chew, or eat. While pica can stem from behavioral factors, it may also occur when a cat has an underlying nutritional deficiency or a condition that affects nutrient absorption. Cats with pica sometimes show interest in surfaces that contain trace mineral residues or dust particles, even if we can’t perceive them. If window licking becomes frequent or expands to other inappropriate objects, it’s worth discussing with your veterinarian to rule out gastrointestinal disease, anemia, or dietary concerns. Ensuring your cat receives a complete and balanced diet and maintaining regular wellness exams can help address nutritional contributors to this behavior.

Is a Cat Licking a Window Harmful?

While this behavior may seem strange, there is not usually anything harmful about it in most cases. The only situation that may make this harmful is if you use a toxic cleaner on your window or window screen. In many cases, cats may like the taste of the residue left behind by these cleaners. However, many cleaners can cause poisoning if your cat consumes enough of them.

Therefore, if you notice that your feline has a knack for licking windows or screens, then we do not recommend using any cleaning products that could be toxic to your cat. Instead, find something that is labeled as safe for pets and children. There are many effective cleaners out there that are safe.

Furthermore, if your cat seems to be licking one specific window or screen, you could put off cleaning that window for as long as possible. Try to limit your cat’s access to that window after you clean it, as most cleaners are most potent within the first several hours after application, depending on the product.

Also, if your cat licks the window or screen that was already treated with toxic cleaner, the best thing you can do is contacting your vet.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

Conclusion

Cats may lick windows and window screens for all sorts of reasons. Most of these reasons are completely harmless. For instance, cats may lick these surfaces because they are curious. Other cats may lick the window because they like the flavor or scent of the material or the cleaner that you use. Plastic windows and plastic-mesh screens are especially prone to this, as some materials can retain environmental odors that interest cats. However, it’s important to remember that cats explore their environment with both their noses and mouths, so occasional surface licking can simply be part of normal investigative behavior.

Typically, there is no reason to worry when your feline licks a window or screen. However, it can mean that they are out of water or prefer running water, especially if they are currently drinking out of a stagnant bowl. If you use a toxic cleaner on the window or window screen, you may want to change cleaners until your cat stops licking the window. Many cleaners can be harmful in even very small amounts. Choosing pet-safe products and ensuring the surface is fully dry before allowing access can significantly reduce the risk of accidental ingestion.

Featured Image Credit: Azovsky, Shutterstock