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Marissa O.

Star Sitter

Fowlerville, MI

5.0 out of 5 stars
68 reviews
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Services

Marissa can care for

Cats
0 to 15 lbs
16 to 40 lbs
41 to 100 lbs

Availability

Full-time pet sitter with flexibility. Calendar is updated regularly. Please ensure that there is plenty of time to schedule a Meet & Greet prior to booking!

Available
Not available
SMTWTFS
House Sitting Cancellation Policy:

About Marissa O.

Communication

11 repeat pet parents
96% response rate
Usually responds in under an hour
100% bookings with photo updates
Sends updates with Rover Cards

Dog skills

10 years of experience
Oral medication administration
First aid/CPR
Senior dog experience
Special needs dog experience
Can provide daily exercise

Cat skills

Oral medication administration

Safety, trust & environment

Pets are supervised at all times while outdoors, even in a fenced-in and/or secured environment. No other animals are brought into a client’s home unless otherwise requested.

Information Marissa O. would like to know about your pet

I am grateful when clients keep me informed about any changes to the pet's health or behavior during each booking. It can be very helpful in fulfilling each pets’ personal needs. -M

A typical day

Marissa likes to stay active, so she enjoys walks and playing with pets. She also enjoys reading, which can be a surprisingly fun enrichment activity for some pets. On a hot summer day, she might take her dog to the lake to cool off and sunbathe.

Location

Fowlerville, MI

Marissa O.'s Neighborhood

Pets

Marissa O. has Star Sitter status

The Star Sitter program highlights responsive sitters who deliver highly rated care and have a history of listing accurate availability and preferences, making it easier for pet parents to find the best care for their pets.

A paws-itive pet experience

Pet care experience

Marissa Ostrowski has spent practically her entire life caring for animals of all shapes, sizes, ages, and personalities. Today, she lives in Fowlerville, MI, with pets of various species! Shortly after graduating high school in 2020, Mercy worked at a doggie daycare/boarding facility, where she gained plenty of valuable knowledge and experience (including Pet CPR and First Aid and keeping a pet safe in any emergency). Some days, she was responsible for the safety and security of up to 25 dogs at a time. From 2024-2025, Marissa went on to work at a veterinary clinic as a dynamic Kennel Technician. Not only did she gain extensive and valuable pet care knowledge, but she was also assigned to a myriad of tasks around the clinic; primarily, keeping patients safe and comfortable during recovery. Mercy is currently enrolled in Animal Behavior College’s Dog Obedience Instructor program, and works hard to reach her goal of becoming a service animal trainer. She hopes one day to have the opportunity to change many lives for the better, pets and people alike.

Cat care experience

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Looking for the purrfect sitter?

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

Reviews

Anthony P.
House Sitting • Jun 13, 2026
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Marissa did a great job with my two dogs. This was my first time using a house sitter, so I was a little nervous but Marissa was professional and great! She sent updates and pictures and my dogs were very happy. When I returned the house was nice and tidy just as I left it. Most importantly, Molly and Baxter loved Marissa and were happy and relaxed when I returned. I would definitely recommend Marissa and will be using her for future dog walks and travel.

Tami & David B.
House Sitting • Jun 04, 2026
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Wow! Marissa was awesome! Our puppy is shy and skittish, but she was able to gain his trust quickly. She followed instructions, went above and beyond and was very trustworthy. Marissa is also awesome with communication.

Laura C.
Drop-In Visits • May 26, 2026
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Marissa has been wonderful! She has gone above and beyond to take care of my kitty cats. She is very detailed and professional, and I always look forward to her updates!

Anthony P.
Dog Walking • May 22, 2026
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Thank you for doing a great job!

About Marissa O.

Communication

11 repeat pet parents
96% response rate
Usually responds in under an hour
100% bookings with photo updates
Sends updates with Rover Cards

Dog skills

10 years of experience
Oral medication administration
First aid/CPR
Senior dog experience
Special needs dog experience
Can provide daily exercise

Cat skills

Oral medication administration

Safety, trust & environment

Pets are supervised at all times while outdoors, even in a fenced-in and/or secured environment. No other animals are brought into a client’s home unless otherwise requested.

Information Marissa O. would like to know about your pet

I am grateful when clients keep me informed about any changes to the pet's health or behavior during each booking. It can be very helpful in fulfilling each pets’ personal needs. -M

A typical day

Marissa likes to stay active, so she enjoys walks and playing with pets. She also enjoys reading, which can be a surprisingly fun enrichment activity for some pets. On a hot summer day, she might take her dog to the lake to cool off and sunbathe.

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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Verified Background Check

Marissa O.

Star Sitter

Fowlerville, MI

5.0 out of 5 stars
68 reviews