Dead patches

Has anyone any idea what has caused these dead patches in my mum's garden?
It's not that dry and has not had any weed killer or lawn feed on it at all, the soil is heavy loam. It doesn't look like fungus attack but I'm not that well up on lawn care.

 

You're probably right Loofah, or foxes.

 

Sorry, should have said, back garden and no dogs around, foxes? not sure if they can get in but yes it does possibly look like pee damage. A few years ago she had Badgers digging up the front lawn but never any dead patches and they haven't been back.
If it isn't pee, any other suggestions?

 

Just wondering if it might be spilled weedkiller.
The pic with the long trail from one patch to another looks like that kind of thing.
If it was something like glyphosate it could have been a month or so ago.

 

Thanks guys, I'll have to check, I discounted weedkiller as she said she hadn't used any at all but at 87 she may have forgotten.

 

I've had trails just like that where permanent weedkiller was applied to a path, and with the rain it "ran" into the lawn, so it could be something spilt that then "ran" - particularly if the "run" is following a slight depression in the lawn?

The top 2 in the 3rd picture look like someone laid a couple of blocks down for a week or two - the grass edge looks very clearly defined, but the angle of the photo may be exaggerating that, and they may be the same to look at, and cause, as the others.

 

They are all posibillities, I'll have to ask her about it.

 

if the 2nd photo is dog pee ... best take it to the vet as there is something wrong with the dog

I agree that perhaps some chemical such as weedkiller was spilt