For any Pet

• A major change in your pet's behavior (a vocal dog stops barking, a laid-back cat gets frenetic, a talkative bird loses his voice)
• Turns up his nose or beak at food he has always enjoyed
• Stool appears different (in color and/or consistency)
• Hides for more than a day and/or night
• Persistently throws up
• Breathes heavily while resting (and heat is not a factor)
• Has a significant change in his sleep habits
• A placid pet gets aggressive with a family member or pet
• Sheds excessively (or loses feathers)
• Has new lumps or a wound that isn't healting

For a dog or cat

• Has difficulty going up and/or down stairs
• Urinates frequently
• Has smellier breath
• Lacks stamina

For a cat

• Doesn't groom regularly; has an unkempt appearance
• Misses the litter box

For a bird

• Doesn't preen as often; looks disheveled with puffed-up feathers
  

• Has stained feathers above the nostrils
• Has a slouched appearance
• Has a suddenly overgrown beak
• One eye (or both) is partially closed for extended periods

For a reptile

• Excessively sheds skin