Use 'if' but no 'else' to accomplish this

newbie here again. I am trying to accomplish the following question but stuck on the condition in bold:

• get user input in variable: about_pet
• using a series of if statements respond with appropriate conversation
• check if "dog" is in the string about_pet (sample reply "Ah, a dog")
• check if "cat" is in the string about_pet
• check if 1 or more animal is in string about_pet
• no need for else's
• finish with thanking for the story

Code I wrote:

about_pet = input("Enter a sentence about a pet: ")

if 'dog' in about_pet.lower():
    print ("Ah, a dog")
if 'cat' in about_pet.lower():
    print ("Ah, a cat")
elif 'dog, cat' in about_pet.lower():
      print ("Ah, there is one or more pet")

print("Thank you for your story")

I tried few other ways but stuck. Could you help me to solve this?

Thank you in advance!

Thank you all for help! I dug up the course forum and seems to me the instructor is pitching to use boolean. i.e 'dog' in about_pet.lower() == True to verify if the input statement has more than one pet or not. I am stuck here how to utilize boolean to check the input statement.

Thank you all again for help!