The borrowers on BorrowMyDoggy have a variety of different availabilities. Some might be able to offer the odd walk here or there, some are able to have your doggy over night, a weekend, or sometimes longer. Each relationship between Owner and Borrower is different and it's key that both parties know one another really well before a dog stays with a borrower.
If you are looking for care over a few months, then we would highly recommend looking into specific dog fostering. You are more than welcome to look into our website for a borrower, however often our borrowers are not able to accommodate your doggy for a longer duration.
There are several charities such as Dogs Trust and the RSPCA that may be able to help.