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Marissa O.

Fort Collins, CO

5.0 out of 5 stars
8 reviews
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These prices are for 1 dog, including a booking fee of 11%.

Services

Marissa can care for

Cats
0 to 15 lbs
16 to 40 lbs
Dogs over 1 year old

Availability

From August to May, school is my full time job, but I am available most weekends for 3 drop ins a day, this can be adjusted if requested. If you are seeking drop ins on weekdays please message me so we can determine together if my schedule is a good fit for your pet!

Available
Not available
SMTWTFS
Drop-In Visits Cancellation Policy:

About Marissa O.

Communication

1 repeat pet parent
100% response rate
Usually responds in a few minutes
100% bookings with photo updates
Sends updates with Rover Cards

Dog skills

6 years of experience
Oral medication administration
Injected medication administration
Senior dog experience
Special needs dog experience
Can provide daily exercise

Cat skills

Oral medication administration
Injectable medication administration

Safety, trust & environment

I am able to feed and play with your furry friend or if they prefer to just stare and watch me I can accommodate that as well. If your pet has medication requirements I can make sure they get the medications they need whether it is oral or injectable! I am able to provide short walks for pets without a yard & I will scoop litterboxes as needed. Please let me know where cleaning supplies is located in the event of a mess so that I can ensure a clean and safe environment is maintained for your pet.

Information Marissa O. would like to know about your pet

Please make me aware of any triggers or specific things that can cause anxiety in your pet. As a vet assistant I handle dogs and cats of all temperaments throughout the day and safety of your pet and myself is my top priority. Please alert me to medical conditions such as diabetes, Addisons disease, seizures, etc. so that I can provide the best care possible to your pet. If your pet needs to be medicated, please list the medications and instructions.

A typical day

I'll make sure your pet is mentally stimulated and will spend time playing with them and can offer some designated treats! If your pet knows tricks or has treat puzzles I'd be happy to do those activities as well.

Location

Fort Collins, CO

Marissa O.'s Neighborhood

Pets

Vet assistant of 3 yrs & pet parent

Pet care experience

I am a first year veterinary student at CSU with many years of animal care/handling experience. I have personally owned cats, dogs, and rabbits. I have around 3 years of experience within the veterinary medicine field as a veterinary assistant caring for dogs and cats of all ages and temperaments. I am very comfortable medicating pets, whether it be pills or injectable meds. Animals are an incredibly large part of my life, evident by my pursuance of becoming a veterinarian. I would love to work with you and your pet!

Cat care experience

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Vet assistant of 3 yrs & cat parent

Marissa also cares for cats. Learn about their cat-specific care experience.

Reviews

Teri L.
Drop-In Visits • May 21, 2026
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Marissa was great, she was timely and very communicative and knew what she was doing during her visit.

Tonya M.
Drop-In Visits • May 18, 2026
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Marissa was very attentive to our kitties while we were away. They both require medication and she administered with no problems! Would highly recommend her for future bookings.

Anna R.
Drop-In Visits • Apr 30, 2026
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The best dog sitter!!

Tisha D.
Oct 26, 2021

We have known Marissa for over 6 years. She is a caring, responsible person of integrity who people & animals love, trust, & admire. Our 2 rescue dogs run to the door when we say her name. She takes great care to make sure they are loved, fed, taken out, and receive all of their medication. If we can't be home to care for our fur babies, there is no one else we would rather have looking after & loving them!

About Marissa O.

Communication

1 repeat pet parent
100% response rate
Usually responds in a few minutes
100% bookings with photo updates
Sends updates with Rover Cards

Dog skills

6 years of experience
Oral medication administration
Injected medication administration
Senior dog experience
Special needs dog experience
Can provide daily exercise

Cat skills

Oral medication administration
Injectable medication administration

Safety, trust & environment

I am able to feed and play with your furry friend or if they prefer to just stare and watch me I can accommodate that as well. If your pet has medication requirements I can make sure they get the medications they need whether it is oral or injectable! I am able to provide short walks for pets without a yard & I will scoop litterboxes as needed. Please let me know where cleaning supplies is located in the event of a mess so that I can ensure a clean and safe environment is maintained for your pet.

Information Marissa O. would like to know about your pet

Please make me aware of any triggers or specific things that can cause anxiety in your pet. As a vet assistant I handle dogs and cats of all temperaments throughout the day and safety of your pet and myself is my top priority. Please alert me to medical conditions such as diabetes, Addisons disease, seizures, etc. so that I can provide the best care possible to your pet. If your pet needs to be medicated, please list the medications and instructions.

A typical day

I'll make sure your pet is mentally stimulated and will spend time playing with them and can offer some designated treats! If your pet knows tricks or has treat puzzles I'd be happy to do those activities as well.

Each sitter joining Rover needs to pass a background check. And by booking on Rover, you can get photo & message updates, 24/7 support, and reimbursement for eligible vet care.
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Marissa O.

Fort Collins, CO

5.0 out of 5 stars
8 reviews