help with training

DH and I adopted an 8 year old terrior from little shelter. She is so sweet, loving and is totally trained.

Well she was fine for the first month or so, now she has accidents in the house every so often. It is odd b/c she can go 8-10 hours without being walked, then sometimes we will walk her - she does her business but an hour later she pees in the house Any ideas?

I am thinking maybe it has something to do with being in a kennel where they just 'went' instead of being walked. She doesnt let us know when she needs to go either.

DH bought wee-wee pads to try to prevent accidents and she does go on those when she goes in the house thank god.

HELP

my yorkie has that issue but that's cause he sometimes drinks way too much water. is she drinkin a lot?

the problem i see with the wee wee pads is that now she thinks she can go in the house instead of being trained to hold it and only go when she's outside.

how many times a day is she walked?

ETA: also if the urine has a strong odor that may be a indication of a UTI and you should get her checked out.