Welcome to Brentwood Animal Hospital, proudly serving pets and their families in Hyattsville, MD and Washington, DC. As a trusted local vet clinic, we’re here to help you recognize the early signs of illness in pets—because fast action can make all the difference. Whether you’re visiting our veterinarians near Hyattsville for a routine exam or responding to a health concern, knowing what to look for can save time, money, and even lives.

Sometimes your furry friend can’t tell you something’s wrong, but their body and behavior will. In this post, we’ll walk through some of the most common and overlooked signs your dog or cat might be getting sick—plus what to do next.

Why Early Detection Matters

Spotting the first symptoms of sickness in dogs and cats can give your vet a valuable head start. Many pet illnesses, from infections to chronic conditions, respond much better when treated early. At Brentwood Animal Hospital, we regularly see pets who recover quickly—because their owners acted at the first warning signs.

If your pooch or kitty is acting off, don’t assume it’s nothing. Pay attention to small shifts in appetite, energy, or behavior. Even subtle changes can be signs of something more serious going on.

Behavior Changes That Could Mean Trouble

Is Your Pet Acting Different?

If your usually playful pup seems withdrawn, or your cat hides more than usual, those may be signs something’s wrong. Changes in temperament or activity level are often early pet health warning signs.

Watch for:

• Lethargy or sudden hyperactivity
• Hiding or avoiding contact
• Increased clinginess or aggression
• Whining, growling, or vocal changes

Even a laid-back feline companion can send up red flags with small behavioral shifts. Don’t ignore your instincts—you know your furry bff best.

Appetite, Thirst, and Bathroom Habits

When Eating, Drinking, or Potty Patterns Change

A healthy pet usually eats and eliminates on a predictable schedule. If something seems off, your vet near Hyattsville or DC should take a look.

Call your veterinarian if you notice:

• Loss of appetite for more than 24 hours
• Excessive thirst or urination
• Straining to urinate or defecate
• Vomiting or diarrhea (especially if it persists more than a day)

Cats are especially good at hiding illness—so if Fluffy stops eating or starts missing the litter box, call your veterinary clinic near me right away.

Breathing, Coughing, and Nose Issues

Respiratory Red Flags in Dogs and Cats

Coughing, wheezing, or nasal discharge can all be early symptoms of sickness in dogs and cats. These could signal infections, allergies, asthma, or something more serious.

You should always call your vet clinic if you see:

• Persistent coughing or sneezing
• Labored or fast breathing
• Discolored nasal discharge
• Gagging or wheezing

In our Hyattsville animal hospital, we see these symptoms more often in senior pets and short-nosed breeds—but no pet is immune.

Skin, Eyes, and Coat Condition

What Your Pet’s Outside Can Say About the Inside

Your pet’s appearance offers big clues about what’s happening inside. A dull coat, itchy skin, or red eyes might be early signs of internal issues, parasites, or allergies.

Symptoms worth checking out:

• Excessive licking or scratching
• Hair loss or flaky skin
• Eye redness, discharge, or squinting
• Pale gums or changes in skin color

Your veterinarian near Washington, DC may recommend blood work, allergy testing, or parasite screening based on what they find.

Sudden Weight Loss or Weight Gain

Unexplained Changes May Point to Disease

If your four-legged buddy is gaining or losing weight without a diet change, it may be a sign of underlying illness like thyroid disease, diabetes, or digestive issues.

Track your pet’s weight regularly and call us if you notice:

• Rapid or unexplained weight gain
• Noticeable weight loss
• Bloated appearance with no appetite
• Refusing food but still gaining weight

Your vet near Hyattsville can perform a physical exam and lab tests to find the cause early—before it worsens.

When to Act Fast

Some signs require immediate care, not a wait-and-see approach. Call Brentwood Animal Hospital or head to your nearest emergency animal hospital if your pet:

• Collapses or can’t stand
• Has seizures or tremors
• Bleeds without explanation
• Is unresponsive or extremely weak
• Has a swollen, hard abdomen
• Can’t breathe normally

These are true medical emergencies. Don’t delay—your pet’s life may depend on quick action. Learn more about recognizing signs of pain in dogs at the Cornell University College of Veterinary Medicine website here. The Blue Cross has information on signs of pain in cats on their website here.

FAQ

How can I tell if my pet is sick or just tired?
Tiredness that goes away after rest is normal. But if your pet is sluggish, won’t eat, or acts strangely for more than a day, call your vet.

Can pets get fevers?
Yes. Symptoms like warm ears, red eyes, or panting may indicate fever. Only a vet can accurately confirm it—don’t guess or give human meds.

Is it okay to wait a few days before calling the vet?
It depends on the symptom. Minor issues might resolve, but many signs of illness in pets need attention within 24–48 hours. When in doubt, call us. We also recommend having a pet first aid kit on hand for emergencies. Check out our blog on this here.

Visit Our Hyattsville and DC Veterinary Clinic

At Brentwood Animal Hospital, we’re passionate about catching health problems early so your furry friend can stay well. If you’ve noticed any changes—or just want peace of mind—our vets in Hyattsville, MD and Washington, DC are here to help.

Looking for a great veterinary clinic near me? Call us today to schedule a check-up. Visit our Service Page here to learn more about the services we offer and the type of pets we see. Recognizing the signs of illness in pets early is one of the most loving things you can do—book your appointment now.

This blog is for informational purposes only. Always consult your veterinarian for accurate medical advice, diagnosis, or treatment specific to your pet.